Malicious PDF — malware analysis report

Static analysis result for SHA-256 925c3673b0e1af3c…

MALICIOUS

PDF

77.8 KB Created: 2021-07-13 19:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f01f9fb24e62b26f7cbc62be2fa95e8f SHA-1: 5bac4517e99268e21d6a4ea89fd37fda19712389 SHA-256: 925c3673b0e1af3c60cdf88619e416bb73ba871222a5f6e5815560c61c83313f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of embedded URLs, although many are marked as benign, suggests an attempt to lure users to external resources. The wkhtmltopdf authoring application is unusual for a typical PDF and may be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

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://feedproxy.google.com/~r/sq/ugae/~3/hIkXU_AiHkM/square?utm_term=sobbing+meaning+in+english
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7b8315c1b8460033cffca/1625798705746/small_tits_video.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed8fb566c2900cf5629063/1626181557401/konunuveduzixa.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e778efe6052d54f78a60b0/1625782511646/wagosunizujevirijat.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79bc44b964f05b8447db1/1625791428984/28567818369.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_off0000cbef.bin
6d09673e91e4b78449788b580598173318a0fae9647c9fd53966e412e85461ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 17532 bytes
font_01_sfnt_off0000fa3f.bin
27dfb757467e8713ad0e354eb4f0283ca00860502de22242a64a9d3f4280d029		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 10572 bytes
font_02_sfnt_off0001121e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 16792 bytes

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