Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db545226c6004ed…

MALICIOUS

PDF

80.6 KB Created: 2021-07-14 05:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fabc6e66297fdef6b783869b1346d56d SHA-1: a3577918d159f052759f3288655baf3a5c557a11 SHA-256: 1db545226c6004eda0f70f1f504fa5c0a65aca3fd89ba8f81c795896a46e6aa7
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 'ketchas.ru', which is likely a phishing lure. Although no scripts were extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site, consistent with phishing or malware distribution via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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://ketchas.ru/square?utm_term=polynomial+by+degree+and+number+of+terms
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed92ec840a1961e7b8b6f9/1626182380280/febimizeparizebivamalasep.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7993938ed220952a9a3d8/1625790777643/61828806534.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e83d6dc3e732754cebee0f/1625832813634/zovemiputoparenij.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_off0000d85d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 16792 bytes
font_01_sfnt_off0000f06f.bin
a3f83467c8baaf1916b78e945b82951acc88ea9fdeec07ddb5bc42514236a242		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 17048 bytes
font_02_sfnt_off00011d3f.bin
1c729e817bd2606bbcbcac1685d1ace3162df501c219d06d5aac1c8f4e1fc0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 11052 bytes

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