Malicious PDF — malware analysis report

Static analysis result for SHA-256 688ad084bd9fc3cf…

MALICIOUS

PDF

71.9 KB Created: 2021-07-14 08:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80c79cc95cd8090784aac4c998edc4f1 SHA-1: 42553f700d0eeb31bc9c61ce357fafebb2029a0e SHA-256: 688ad084bd9fc3cf01542bc918be23616856b4b9a6d9fa64b7f8fd4b8847c3d6
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 URI pointing to a suspicious domain, which is a common tactic for phishing lures. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.1829

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://nomylo.ru/square?utm_term=sql+server+group+by+where
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee6b1f8e3fff2bd3c3441b/1626237728114/st_claires_after_school_club.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_off0000bb45.bin
ee4dcdaf8617ff8c61bd79ac71f1db70b78e28eee4367099c064e6cc15005514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB45 10800 bytes
font_01_sfnt_off0000d3d6.bin
3731086b26f9867921a0dea000ccf869ecf27deef616b58aac78e7362b905488		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 15656 bytes
font_02_sfnt_off0000fbea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 16792 bytes

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