Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa5d6a57ac78127…

MALICIOUS

PDF

74.6 KB Created: 2021-07-13 16:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df0048582a9292407c13ad82aa315da6 SHA-1: bd32ba2a0251256559cbccf3388da579f843a06a SHA-256: cfa5d6a57ac781272288524f2b516e6eb4dafcea8fe6c566745b9761feb9525b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating a phishing attempt. The presence of embedded URLs, although some are marked as benign, suggests a potential lure. No scripts were extracted, but the PDF structure itself is indicative of malicious intent, likely to trick users into downloading further payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/UQ8tT55rDuk/square?utm_term=subtraction+of+whole+number+and+mixed+fraction
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e95c5819a9f87deb74991a/1625906265028/lijewa.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecb690ea0e4f2fd4895200/1626125968116/directions_to_boca_chica_beach.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed2d3c5eed834fcc3399b8/1626156348674/how_to_change_colour_of_fill_and_sign_in.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e00ac14ff043cd5951ce/1625874442976/87673996131.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_off0000c19e.bin
b84751585ea4312675075e2e1876108b03329919a50c3e15ac2598d64a05216e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 16556 bytes
font_01_sfnt_off0000ecdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 16792 bytes
font_02_sfnt_off000104f4.bin
c31671fe26d6c604a7c3de4f91449303cf1d8896179e3eb064a39552a6298d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 11076 bytes

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