Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5705f184f2163b3…

MALICIOUS

PDF

79.2 KB Created: 2021-07-14 03:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2142a7f7477ae5037c7f49dbdbe0b168 SHA-1: 471cfdfe9ada732def2caac60c631f029e6c94e9 SHA-256: c5705f184f2163b33379e4abf79715dfc0d9cd9b5220e3a614ca5ae960ae9525
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 phishing or trojan threat. It contains embedded URLs that likely lead to malicious content or further stages of an attack. The PDF structure itself is suspicious due to duplicate object bodies, suggesting potential obfuscation or malformation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/gOBB6uaVNRA/square?utm_term=frog+dissection+custom+crossword+puzzle+answers
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee27c927fa864c7d102415/1626220489830/tekojudonifoxosepa.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edc815895aae42f657d87a/1626195989521/limited_to_but_not_including.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecb4bdfdfcd34ed011f3d1/1626125501548/fokudutibileketu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7adda81471576eaea74eb/1625796058326/fulebeguworokaxol.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e802baf4d7c53d8b14c49e/1625817787285/49562467873.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_off0000d40b.bin
ae13281fc248e36c9c69b2fccafbd081e1e9eade649e899cfd67afbb5bf49655		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 16436 bytes
font_01_sfnt_off0000feb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 16792 bytes
font_02_sfnt_off000116c8.bin
51784a4bf5ac8fdc2024f6cb6a0988c69408ef2175a5ac89ec43d49e2c18d252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 11080 bytes

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