You will never find an official "rufus-android.apk." Any website claiming to offer one is either a hoax, a virus, or a mislabeled third-party tool.
App to flash USB stick with ISO like Rufus/etcher : r/androidapps rufus android version
If you need to fix a crashed PC and only have your phone, follow these steps using an app like Download the ISO You will never find an official "rufus-android