Microsoft 365 android app

I downloaded a modded Microsoft 365 apk from apkmody and it works flawless. Even cloud syncing works without any problems. My issue is that only apkmody seems to have the modified app. No other 'trustworthy' apk site seems to have it (such as mobilism). I've run the app through virus total and it shows no detections, but I still have my doubts whether or not this app is legit, or virus ridden.

I did get a notification that the app was running in the background for prolonged periods of time (it took about 9.5 kb of data in the background), so I've disabled all that now. Not sure if that is normal behaviour. I've linked my Windows account (and main email) to use the cloud functionality (activated on Windows using MAS), but apart from 1 attempted Facebook login that wasnt me not much has happened. Has anyone any experience with using a cracked microsoft 365 app on Android?

Edit:

Allot of people still come back to this thread. One quick note: for some reason this apk DOES NOT WORK ON TABLETS!!

For preservation purposes I have the link to the apk here:

aHR0cHM6Ly9sbjUuc3luYy5jb20vZGwvYTQxZWJkYmIwLzhzazczemJpLWM2cWU3eTh2LXQ1bnZkYTd5LXI3bnA5bnA4

It's in base64 so decode it yourself.

Also: don't just trust a random guy on the internet. Run this apk through virustotal before installing it.