Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6621f53398da0b…

MALICIOUS

PDF

182.0 KB Created: 2021-07-16 22:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 438b58ee70e4987eb086e0cd898ee6da SHA-1: 9d7fcdde895396fbd36bf0be70bc74aab273b019 SHA-256: bc6621f53398da0bb410b023c592e9c94520a14af8419dc010e4a9123be2c710
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as a phishing trojan. The PDF contains multiple embedded URLs, some of which are associated with known benign content, but the overall structure and detection suggest a malicious intent to redirect users. The file was authored using wkhtmltopdf, which can be used to generate PDFs from web content, potentially for phishing lures.

Machine Learning

  • Nyx PDF Classifier clean score 0.0245

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=mcquarrie+physical+chemistry+solutions+pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec85a03f7a034ccb7ade61/1626113441089/best_nature_heroes_empires_and_puzzles.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee76e1db6052518ec9c830/1626240738041/26918386941.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a7c.bin
4db01d829b12190eb59211d26224f31795da12325b71e86c53497b66f7456cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 17236 bytes
font_01_sfnt_off00014814.bin
341dbfbdd3f7f5772de6c8d2b145a2ad515fdfffcf0f742c63ec3b722444e48d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14814 133044 bytes
font_02_sfnt_off000296fc.bin
b9f03e5b38e6d9f77660276c681971fc5f7d127a730e1a2775744d946d77439a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x296FC 11236 bytes
font_03_sfnt_off0002b0fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B0FA 16792 bytes

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