It is highly recommended to use official sources to avoid security risks associated with unofficial third-party repositories.
You are downloading a system-level disk image from a public Google Drive folder. Unless the file has a verified SHA-256 checksum matching Apple’s official release, you have no idea what is inside. Keyloggers, cryptominers, or modified system files are common payloads in unverified OS DMGs. --- Macos High Sierra 10.13.6 Dmg Google Drive
download macOS High Sierra 10.13.6 from a random Google Drive link unless you are a sysadmin who can manually verify checksums, disable SIP, and scan for malware. It is highly recommended to use official sources
Before scouring shared drives, try these official (and safer) methods: try these official (and safer) methods: