Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9a47592db1a2a9…

MALICIOUS

PDF

79.2 KB Created: 2021-07-12 22:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 536903d33f94afa79312c7921b0c8f2a SHA-1: 9a83fa9a655cf5457610e51b66f62d6ea5b73e02 SHA-256: 5b9a47592db1a2a92ea7416a2f6594f29b86b5c9e7d956f5a65abd9317a18d9e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains an external URI pointing to a Google feedproxy URL, which is often used to obfuscate the true destination. While the document body is heavily obfuscated and unreadable, the presence of PDF-specific heuristics and the overall verdict suggest a phishing or malicious content delivery attempt.

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/pL_UGxDroB4/square?utm_term=welcome+to+the+nhk
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e936e2563c1506a8b6cfa6/1625896674693/97253954082.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8fe2a5ebba154a8fab047/1625882154871/mudegowenuzukanade.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec868b950202184f10ee16/1626113676094/pebimiwu.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e92639854c1d3b3487241c/1625892409474/wobodurasepi.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec94ef90a3fc49531ad193/1626117359784/world_book_download.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_off0000d7d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 16792 bytes
font_01_sfnt_off0000efeb.bin
833b9b96ca76266ad839d9d6a06bc46be2657668c820aed2662d2dbd7be51b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16604 bytes
font_02_sfnt_off00011b13.bin
f961a5d06d151bf676bac9b06a728f2ff557a51193d56462213de2d4016f3035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 10060 bytes

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