Malicious PDF — malware analysis report

Static analysis result for SHA-256 109747b24399e337…

MALICIOUS

PDF

77.6 KB Created: 2021-07-12 23:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaaf7ee3059295f16d96b4b63aa8da34 SHA-1: 004f741478a7f3d9883ab3c5567e784d332cc5b9 SHA-256: 109747b24399e337a7073327ecdf2c427fcba430e84b2482a48549cb0a17fecc
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 URI pointing to 'krisoc.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to expense management, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.1538

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://krisoc.ru/square?utm_term=superb+cleaner+boost+and+clean
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eca1e41951226b8b8dc836/1626120676280/best_app_to_maintain_expenses.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_off0000cee7.bin
e7609922af526863c76f12dce350fd552002eedef40876df389c2cc166f73852		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 16628 bytes
font_01_sfnt_off0000fa21.bin
c103071936325bded5839c06eb538bd44b965872ce57a0bdea861645e4c750c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10732 bytes
font_02_sfnt_off000112b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 16792 bytes

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