Malicious PDF — malware analysis report

Static analysis result for SHA-256 75222df85750ccc3…

MALICIOUS

PDF

23.4 KB First seen: 2021-07-07
MD5: 7de5cfe4859381c861768a6b192b0734 SHA-1: e7194bcaa58592f77769739f12dc73ff47b99b00 SHA-256: 75222df85750ccc3ab42388e8a6771b5efc7f31fc3d52cf42e35e40d5bc922d8
112 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file that triggers a remote GoTo action and contains a UNC path, indicating exploitation of CVE-2018-4993 or similar vulnerabilities. This suggests an attempt to redirect the user to a malicious resource or capture NTLM credentials. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5506

Heuristics 3

  • UNC path in PDF — possible NTLM credential theft (CVE-2018-4993/CVE-2019-7089) high CVE likely CVE_2018_4993
    PDF contains a UNC path (\\server\share) alongside action triggers — when a vulnerable viewer resolves this path, Windows may send NTLM credentials to the remote host as the matching PDF action is processed
  • Remote GoTo action high PDF_GOTO_REMOTE
    PDF references an external document via GoToR/GoToE whose target is a URL, UNC path, or executable
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL \\127.0.0.1\test In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text

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