Sideload apps on Android devices are often used as a way to bypass restrictions (such as when an app isn't available in your area) or update faster and sometimes it's optional. only when the desired app is not available in the Play Store for some reason.
They work well, but you will have some disadvantages when using this to install the application. Sideloading, for example, is not allowed on Android phones by default, so you must enable Allow installation from Unknown sources in Settings to be able to do so.
Besides, you don't have automatic updates, you have to manually update the app one time an update is available. A more serious disadvantage is the security risk. Because the APK file is not available on CH Play, you cannot be sure that the application is the same as the one from the developer. In some cases, APK files are copied to bypass some restrictions (such as in-app purchases) or worse, malware infection will affect the security of your phone. Therefore, the following article will guide you to scan APK files to check for viruses or not before installing on your phone with some great tools.
1. Metadefender

Metadefender allows you to upload an APK file up to 140 MB in size to be scanned by many anti-virus tools. The APK file is unzipped so that all personal files in the archive are scanned with the entire unzipped APK file.
2. NVISIO APK Scan

Similar to Metadefender, NVISIO APK Scan allows you to upload an APK file through your browser for scanning without any file size limit. All you need to do is select the APK file via your operating system file picker and click Scan package . After a period of time, a scan report will be generated. If you prefer, you can email the scan results to you when the scan is complete.
3. VirusTotal

VirusTotal is another free service that works like the two mentioned services. It analyzes APK files and helps detect all viruses and malware. The only downside to using this service is its maximum file limit of 128MB.
This article aims to introduce you to some tools that help scan APK files before installing them on your device. However, it is better to download the official apps from CH Play or from reliable addresses, and not worry about using errors and are much safer.