Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af8084cd875aaca…

MALICIOUS

PDF

89.2 KB Created: 2021-07-16 06:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b0ea5cf3ab0b50d3a56c57011962b1c SHA-1: e3575f9c47098f7be58dde83a95ce3aed1ec811e SHA-256: 8af8084cd875aacaddcf58830183598fc020929b1fdf407560c797e1f36e2db8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URL pointing to an external domain, which is a common tactic for phishing lures. Although no scripts were extracted, the PDF structure and the presence of an external URL suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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://irlanc.ru/square?utm_term=the+nine+banded+armadillo
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec708cc3fb560d26f0d6ff/1626108044968/10141966527.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecb1879c6b0e71d6d8812e/1626124679131/college_professors_reviews.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_off0000fa80.bin
75572df0391c1d06c685fd023cf717ae00619d7243765008cf85f08ed5170fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 17784 bytes
font_01_sfnt_off000128e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 16792 bytes
font_02_sfnt_off000140f9.bin
5934b86c6aa111dea758abe16396fe9c94a6f5a16b509dba071c7beaddf92d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 10352 bytes

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