Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a829130259f0025…

MALICIOUS

PDF

79.4 KB Created: 2021-07-12 21:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6381febadb03e1c832048a8362ec5b3f SHA-1: 18368dc5f3b1ea8b2fa52aaecc460950091c1acd SHA-256: 5a829130259f0025473aba1b3f31ca9b1d7a5f5b6870123bf6bc4035401cb909
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The presence of embedded URLs, although many are marked as benign, suggests an attempt to lure the user to external resources. The file's structure and metadata indicate it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged for phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

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/iYdez4bKglI/square?utm_term=baby+snakes+that+look+like+worms
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec82f35978cb5ccaaac39b/1626112755126/types_of_teaching_practices.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e772e163e952391ed39b3c/1625780961688/reverse_charge_on_legal_services_under_gst.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e93a2ce51f1f218d6acfc7/1625897516122/write_the_chemical_equation_for_cellular_respiration.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7a01338ed220952aa1acb/1625792531318/40500169583.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e91348f107ff2467e87a27/1625887560493/introduction_to_sociology_short_answer_questions.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_off0000d4ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 16792 bytes
font_01_sfnt_off0000ecc2.bin
a2d9861b67728bca8e8eb2512ed6d44dacc4f23addce674645ee072f5a635ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 10860 bytes
font_02_sfnt_off000105c3.bin
a4976195fa9d8f055b0ec74c1acc3622c2bed1b4374824d2de9b94cc2ee406d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 16936 bytes

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