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The release version strings are documented here BMC Remedy Release Version Strings which says 18.05 patch 5 should be 9.1.05 201808071530.
The one you have looks like this hotfix - ftp://ftp.bmc.com/pub/ARRecommendedFixes/Server/18.05%20(9.1.05)/SR_1805_20181127_CU_ALL.zip
From the README:
Product Component: ARServer
Build Base Version: 18.05
Build Date: 20181127
Fix Type: Hotfix binary
Affected Platform: All
Hotfix Version Stamp: 9.1.05 201811262243
Thanks Mark Walters , you are awesome. In the meanwhile i got the BMC support response as well, they accepted there are lots of dependencies in version string in all modules and it will be fixed in new hotfix.