Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9868e3a0bc63c1…

MALICIOUS

PDF

77.8 KB Created: 2021-07-15 23:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 185637e0333d4839c7d68c1c49443324 SHA-1: 539272e7cbea850261dad6ed3a94a80bba595020 SHA-256: cb9868e3a0bc63c1d1cd7eb64edc47f66764ec63d518a4a0f70ae9e875b69c09
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF as malicious. The presence of an external URI and the overall malicious classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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=the+catcher+in+the+rye+by+jd+salinger+pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8f20e0784948549939b9/1626115872309/mixutafowadutivase.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e80284bab062161339d475/1625817733059/disupezagifibefejasudita.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e89febaea6c4457b8bed9c/1625858027599/xipitexewuroboj.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60efd99c3015c64070c83163/1626331548232/new_restrictions_today.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed3d93f8b4e244e4fc4946/1626160531508/puzuvedawaz.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_off0000ccce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 16792 bytes
font_01_sfnt_off0000e4e5.bin
dc5cbbee9218ff81faab38d91fe9217208cfe8742f068673cd7d0113e145d462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 11128 bytes
font_02_sfnt_off0000fe5c.bin
e85b1f46469fead9769b2a3ab5476c0bf1fa39d51519595bb0c14634788ba976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 17264 bytes

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