Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fea8f7b88c596c…

MALICIOUS

PDF

102.7 KB Created: 2021-07-17 20:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9306ecd2da0fa21c4eba9ca29e088a9e SHA-1: 28651a8f0b754f7a893c5b5c76c428e4544e383f SHA-256: a5fea8f7b88c596c7000dd3b1b871568dd782c003c7e938cb53fa3282fdea6ec
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains multiple embedded URLs, one of which is associated with a phishing lure related to 'auditing and assurance services'. While no scripts were explicitly extracted, the presence of embedded URLs and the ClamAV detection strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.1093

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/sq/ugae/~3/mHcMeCcfVl0/square?utm_term=auditing+and+assurance+services+7th+edition+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e804f2e8ef4d41b4fc68c9/1625818354506/wumokosoberunetexote.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f055407affba70db7d6e15/1626363201567/33918387679.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_off00012edf.bin
9f552d964e256479c5e206404f9995a203e82bee8aae80272390d71e25173d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 11052 bytes
font_01_sfnt_off0001487a.bin
548a9b0132ca21c33be506b1e95a5ca9867cc8d9d4920de4994ce10ef0282df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1487A 17748 bytes
font_02_sfnt_off0001770e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1770E 16792 bytes

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