Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9cd56da0451a25…

MALICIOUS

PDF

73.5 KB Created: 2021-07-13 21:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 847b83dedc20d31d53d4186b14dec64d SHA-1: 5ab49a54c78c40c3f106b914c8cd439b88f9c8a9 SHA-256: ca9cd56da0451a25397e2159730fe81f164a47b53be874b22f20d38da62017ce
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URL pointing to 'pistant.ru', which is likely part of a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to direct the user to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1751

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://pistant.ru/square?utm_term=how+to+change+the+boot+sequence+in+windows+10
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed9bda54e5b71ae84e0a96/1626184666566/mean_platelet_volume_in_thrombocytopenia.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_off0000bf13.bin
078e6bb35439e4f38e24f881c12397b88751886fd113573e3310c5bcb4e7e3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF13 16140 bytes
font_01_sfnt_off0000e8ae.bin
33c080c6113845738874b70458a339c3d5d33ec4c862beffe9e3b59dadf5533c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 11140 bytes
font_02_sfnt_off00010235.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 16792 bytes

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