Compare the file's checksum with Apple's official documentation to ensure it hasn't been tampered with.
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/USBHIGHSIERRA --nointeraction download mac os high sierra 1013 6 dmg google drive work
Some legitimate tech archives (e.g., dosdude1’s patcher tools , Internet Archive) host the InstallMacOSHighSierra.pkg or .dmg . dosdude1’s patcher tools