Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b534aa58a27e84b…

MALICIOUS

PDF

81.1 KB Created: 2021-07-19 10:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 740abbdbf838fe30e1e162abc04ef8bf SHA-1: e82df2c1f080c97d10046a6bdcbdb91cdf7f78c0 SHA-256: 9b534aa58a27e84b6ddd4eebb7b3960e339dcce0ae2dd7657da058a8c68185b0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection indicating maliciousness. It contains an embedded URI pointing to a URL that, while currently marked as benign, is suspicious in context. The PDF structure itself is also flagged for duplicate object bodies, a common evasion technique. No scripts were extracted, but the presence of an external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8554

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/AG-UZpNbJGc/square?utm_term=red+herring+game+answers
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c0bdb825900159c1e1a5/1625866429133/lusagivijuzekalavu.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f10a407c30ad68c63d9fe2/1626409536660/19119683069.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0603b50c44857bb15ead6/1626366011664/everything_stays_piano.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e892346a4b4a6f2e73a2bc/1625854516265/anatomical_name_for_calf_muscle.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f33197699a8678c57975e2/1626550679681/93465758699.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_off0000dc42.bin
b6988d27ae3a94eea2809c01f2e319991b07fd191322565e2db9df3e76733c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 16608 bytes
font_01_sfnt_off00010776.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 16792 bytes
font_02_sfnt_off00011f8d.bin
099e632ab9b62b9c8ccad9236b8e65559bf4043e117af80802f8898992649c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 10564 bytes

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