Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3149537a9940d2…

MALICIOUS

PDF

75.0 KB Created: 2021-07-13 21:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63bfc3666a7f772fc0c4b68195234a14 SHA-1: 9fe46f11fa7fcd80ec0dbd616a6a324cbce472b1 SHA-256: 4e3149537a9940d20ca85ed3475fa7ee160827436bb0f5ccb2426b00b02fd154
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan and also by an ML classifier. It contains an embedded URL pointing to 'https://catamma.ru/square?utm_term=the+digits+of+pi', which is likely the primary mechanism for delivering a malicious payload or conducting a phishing attack. No scripts were extracted, but the presence of an external URI and the detection names suggest a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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://catamma.ru/square?utm_term=the+digits+of+pi
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8bc4ef188817f7e23891/1626115012972/delusional_thoughts_of_grandeur.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94bd3787dde1a90af553f/1625902035974/ziwiwisamarabuf.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7a543687a3d659a4932de/1625793859615/legal_firm_names.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_off0000c3d8.bin
e4168399832f42e27fabf3806ff46f7b86527e3b1f920ea87ba8f0c68d632fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D8 10328 bytes
font_01_sfnt_off0000db13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 16792 bytes
font_02_sfnt_off0000f325.bin
bc0654fe12cc87e0514573974301f91ea0e1844c6e8d2e20fce7c96d9415259d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 17224 bytes

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