Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e0e75d1cf67c91…

MALICIOUS

PDF

76.6 KB Created: 2021-07-21 06:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 300a67afd43c9c27e01a1118c94a0463 SHA-1: 655cfb315572af350f1b6cc7c3d9886456703670 SHA-256: f5e0e75d1cf67c915956011627e59781b87b8d049e644335db38055579cafbcf
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 embedded URLs, one of which is flagged as potentially malicious, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect the user to external content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.2210

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/eoPDrVzwpx0/square?utm_term=what+do+cold+fronts+bring
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec927bc426b81e830127a4/1626116732115/obs_sync_video_and_audio.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edbb00cd7e9b4eaed80332/1626192641077/purujofelasexedanokow.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_off0000cc6e.bin
8f0989293c1aa87df586b54393d7a9a7c256b7fd5161412a73beb843b11c4ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 16244 bytes
font_01_sfnt_off0000f65f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
font_02_sfnt_off00010e76.bin
27bca86a26de15f481f72a676d09554347621058d8adcb4ee6487b56a9be34a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 10756 bytes

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