Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5da428c49bb8d1…

MALICIOUS

PDF

76.5 KB Created: 2021-07-13 05:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6485109c8560f7737122a7369209f6e6 SHA-1: 9950121bf6137aaba3500b4c5998dc331476f971 SHA-256: cd5da428c49bb8d1e3342a01226e234a32152825a99a61b18a1f4703c4cd6a47
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, specifically one pointing to a PDF file, suggests a phishing or social engineering attempt to trick the user into downloading further malicious content. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/~3/4aHNpQc2m6I/square?utm_term=teaching+vocabulary+strategies+and+techniques+pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9205c66be7e490f0f8bb6/1625890908587/the_most_dangerous_game_general_zaroff_character_traits.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7f5d78592fe3a5892b3d5/1625814487382/peter_hollens_i_see_fire.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca89d0f7d8d50062f4e06/1626122397565/sumidutesadidexi.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_off0000ca4e.bin
f3c3f5aac9a79ee4743b138f57d245ff6c35c790eb4694673e1ccf765de5545e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 16056 bytes
font_01_sfnt_off0000f3b5.bin
7cebb76ed7274e5b405c4da2f0b96edeb9fe0b048966cc3ab3431e72021713a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 11428 bytes
font_02_sfnt_off00010df8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 16792 bytes

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