Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9fc39cd634321f…

MALICIOUS

PDF

71.8 KB Created: 2021-07-13 19:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad636ee0a6f2c1a147d5f1fa30342031 SHA-1: 2e4aa840cd9a3dc3667735bf7c32a62c73209b6e SHA-256: 6d9fc39cd634321f9893a5ee6c9fb92394af0858a07f25558f606e219a78b950
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains an embedded URI pointing to 'cructi.ru', which is likely used to redirect the user to a malicious site. The document body is heavily obfuscated, but the presence of the external URI and the ClamAV detection strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1829

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://cructi.ru/square?utm_term=different+types+of+urinary+incontinence
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e897b4cbb59707e327bd5e/1625855925038/13347008216.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_off0000bb6d.bin
913e8691339faf5bd283dd5ee4c9b38fab64f603bb79c649829487c81ef9028d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6D 10644 bytes
font_01_sfnt_off0000d400.bin
ad73c0dad48222eeae76c33309492dc9b8e09e9970269af20d359471fb49b691		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 15368 bytes
font_02_sfnt_off0000fb34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 16792 bytes

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