VirusTotal - VirusTotal is a free service that analyzes suspicious files and URLs and facilitates the quick...

URLscan.io - urlscan.io is a free service to scan and analyse websites. When a URL is submitted to urlscan.io, an automated process will browse to the URL like a regular user and record the activity that this page navigation creates.

Cuckoo Sandbox - Cuckoo Sandbox provides detailed analysis of any suspected malware to help protect you from online threats.

CyberGordon - Aggregator of cyber reputation checks with more than 30 engines (threat intel sources)

Any.Run - Interactive malware hunting service. Any environments ready for live testing most type of threats.

MalShare - MalShare is a public malware repository providing access to malware samples that have been reported by users.