Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc446d4649699812…

MALICIOUS

PDF

78.2 KB Created: 2021-07-16 02:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a13681d0cc0c23993e2b1b963295b85 SHA-1: 9310b1546ad8f0624793409d799b92b1e159eb54 SHA-256: cc446d4649699812251de0dce2b85e45409c1c930f66cd5fb4a3187fac490707
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user or download additional content. The PDF structure and heuristic firings point towards exploitation of a PDF vulnerability for initial execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6665

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://feedproxy.google.com/~r/razvivatel/yapz/~3/NsX9ihectO0/square?utm_term=low+grade+prostate+cancer
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e847acba193607d16cb3f1/1625835436439/army_course_codes.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed9ea7151a035e9e7bdcaf/1626185383563/78628671127.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7f4ae45e16b3be7eaddd4/1625814190430/wotalorasogusiwudexojis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d078.bin
3ee5a3f24b86fe8cf09f6083a1517d63a2a5538c9813d411467158687d8a30c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 10592 bytes
font_01_sfnt_off0000e8a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 16792 bytes
font_02_sfnt_off000100b8.bin
14162bcb1c0c1428a7a6d85068d215f197cb1d8b66d68f07948413fafda169d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 16460 bytes

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