Malicious PDF — malware analysis report

Static analysis result for SHA-256 9725c60cfb9c2a4e…

MALICIOUS

PDF

79.7 KB Created: 2021-07-16 05:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61e56999803b56f8e4c44492be46b869 SHA-1: 0e934a326f5addd8cc45f263c96dc76497126383 SHA-256: 9725c60cfb9c2a4ef7c82eae019d928f9d2c6b39c9859d2482198bfea5332a6c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect users to malicious sites. The PDF structure and the authoring application (wkhtmltopdf) are consistent with malformed or intentionally crafted documents used for exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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/~3/0YvHz_IItD0/square?utm_term=cursive+fonts+for+css
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e84b4ce41cee5c0c7848bc/1625836364513/earth_excavation_meaning.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee36873753dc428c87e067/1626224263979/how_to_play_mortal_kombat_xl_xbox_one.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee0a821cf0e6777f2a8723/1626212994562/tisobepuz.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_off0000d739.bin
fdec5a7a0a4cf36fdbf50c0ed8dc75bad12cbe15c8de290a2810f519615221e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 10320 bytes
font_01_sfnt_off0000eeb2.bin
19a519662f5135729188af7832e6f8d19cc4a973d5824294249047a334216325		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 17164 bytes
font_02_sfnt_off00011bc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes

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