Malicious PDF — malware analysis report

Static analysis result for SHA-256 f221725b7c6cf687…

MALICIOUS

PDF

74.5 KB Created: 2021-07-13 21:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96a0bd8674c7d8f20a9b288c04a563e7 SHA-1: dad0825132d1738ec776f65b027072cbc854a026 SHA-256: f221725b7c6cf6872eee87b0041db1ec031820e4884690dba8ccf79e16ad5895
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains an embedded URL that, while currently flagged as benign, is likely intended to redirect the user to a malicious site. The PDF structure itself is also noted for duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2593

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/~3/5Aj-mlxkUx8/square?utm_term=internet+downtime+monitor
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8db8934d360eb28904b5/1626115512790/direct_and_indirect_speech_rules_for_questions.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8e331f492d21a0f67ba22/1625875249736/88912684653.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_off0000c51b.bin
c50c682d0ccfb7dd13aa0387d2bc1199b08acf69590160fdc5dec805c9c5fbfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 16512 bytes
font_01_sfnt_off0000f00a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 16792 bytes
font_02_sfnt_off00010821.bin
519f434c3c36eb46864f26caead502ddf070d7a7f9945f6239dc784d169f7cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 10072 bytes

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