Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cfb1609dfac004…

MALICIOUS

PDF

86.2 KB Created: 2021-07-14 06:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec059925bc5b8152e214c2198246bbcd SHA-1: c6cb6c6cbc6ec5db1f81f49f87b3ed99bc6b40c6 SHA-256: c8cfb1609dfac0044d120ebc1182025a3c2aff189637e56dd22f5ca7ddff2ce1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to 'https://crewmak.ru/square?utm_term=save+indesign+document+as+pdf', which is flagged as suspicious. ClamAV detection and ML classification further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a potentially harmful site, consistent with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

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://crewmak.ru/square?utm_term=save+indesign+document+as+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecb1b5f9f3f24b30c50c1a/1626124725701/who_signs_endorse_here_on_check.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8e5d258c6623f037eeecc/1625875922265/most_abundant_gas_in_the_universe.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7f897a1add4dee1f18d6/1626111881298/gefarinopomisidexu.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_off0000ec7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes
font_01_sfnt_off00010496.bin
50b995d007016548e01d5e2cab5094d9770384b45bb29c09b97049ff18082751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 11060 bytes
font_02_sfnt_off00011e1e.bin
497a3dfe70613e8ed2da727b02dbdc7fb6d916a05accc7d49e2c2ae6446183a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 17652 bytes

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