A Google site that allows you to upload a file (up to 650MB), an file hash, or an URL to be checked against 60+ AV engines and the like. Depending on what is supplied, you may get sandbox results under the BEHAVIOR section of the results.
Hybrid-analysis.com (free/paid options)
A Crowdstrike site that allows you to upload a file (up to 100MB)/hash/URL to be sandboxed in a non-interactive fashion and have the results presented (dropped files, sample classification, network connections, etc).
Any.Run (free/paid options)
A site that allows you to upload a file (up to 16MB)/hash/URL to be sandboxed in an interactive fashion and have the results presented (dropped files, sample classification, network connections, etc).