Malicious PDF — malware analysis report

Static analysis result for SHA-256 865f52b1ef9c5fd0…

MALICIOUS

PDF

74.4 KB Created: 2021-07-13 18:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3f41be498fccaece9e49182bf853fcb SHA-1: 2fa362902540d040a88feb474d354f8cb980c65c SHA-256: 865f52b1ef9c5fd0ece858e4cec2222d08e4c4f98b1fe612b9b70abaaf964af9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests an attempt to redirect the user to potentially harmful content. The wkhtmltopdf authoring application and the malformed document body indicate a non-standard PDF creation, often associated with exploit delivery or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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/~3/4P1vZUbBa90/square?utm_term=dissociative+identity+disorder+cure
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9743def1ca41d5faff96/1626117955355/18665471998.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7185ad4a1a22a3e599c3/1626108293709/zafexevi.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8925d26d281541e6f0ef8/1625854558004/tafotilariwenunorikadojol.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_off0000c311.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC311 16792 bytes
font_01_sfnt_off0000db28.bin
9293034fd79a18f279aac183cac8c38eb2f52c173bb5a8214614e08e459a4d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 10600 bytes
font_02_sfnt_off0000f393.bin
feff42c139053d59136488e9a8d63fc476eb9b3291bad38e7b2b602ab2912bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 16352 bytes

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