Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0872fb8d368242…

MALICIOUS

PDF

83.3 KB Created: 2021-07-13 16:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40ac5c7d39487555d458fd46f2d21a21 SHA-1: 43176ab5b2ce2736602d6c410fb9088b0f03f1c0 SHA-256: 6c0872fb8d3682427e948346b58e877f378f4e449f9d5d57573d603f7d55288d
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's a phishing trojan. A heuristic also flagged an external URI pointing to 'cructi.ru', which is likely the malicious destination. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user reading but rather to host the malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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=american+embassy+in+ho+chi+minh+city
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e84ebccfbb16116150410e/1625837244852/can_you_wash_wool_pants.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e93236c91b61347ea444ac/1625895478161/wefid.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_off0000e40d.bin
043d8c704ba2a03eead487e1e3131256ab758efb37a9bcc8cfcdab179a6af4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 10684 bytes
font_01_sfnt_off0000fc6a.bin
e3328b26f218a4895fab1bc31f2e8a005399fa09cb57b0c86128f90a53afef54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 17228 bytes
font_02_sfnt_off0001293a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 16792 bytes

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