Malicious PDF — malware analysis report

Static analysis result for SHA-256 86159e2137898aa3…

MALICIOUS

PDF

72.8 KB Created: 2021-07-14 00:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af69279af694ae13c23d053870d46687 SHA-1: 03e4deac10c2d325598d7c5f9d61f74db617dc1a SHA-256: 86159e2137898aa3919a92d56ec441d12c2e74f6f5dc803ba26fb4b7a61e9cc3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'crewmak.ru', which is likely used for phishing or to download a secondary payload. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7185

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://crewmak.ru/square?utm_term=abc+cognitive+behavioral+therapy
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee03b2e83f616bcf86dee9/1626211250612/winisaxakidimedimugodiw.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ecd2349008a45f4b342dee/1626133045019/cooking_brats_in_the_oven_at_400.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee0a504d490f67274df397/1626212945107/34658424687.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_off0000bf86.bin
182bcddbbe8d1a5a52c690b876621a9ef9e545c756c0c5f1c0ddf391d00061d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF86 10788 bytes
font_01_sfnt_off0000d82e.bin
3ca12ada167941f118768697a00ed853d01a87dd88af26f96eb6f57fc5a2622c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 15524 bytes
font_02_sfnt_off0000ff88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.