Android App Masquerading its Certificate Thumbprint / Fingerprints? How To Verify?

I have an APK that is signed by a company that I find highly unlikely to have actually signed the APK, verified by:

keytool -printcert -jarfile someAppName.apk

I suspect the app author is masquerading the APK as being signed by a company it has not been signed by.

How do I easily / best verify that? I see there's a few websites to verify fingerprints of websites, but what about mobile apps?

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