Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3f51eacb5d4414…

MALICIOUS

PDF

86.2 KB Created: 2021-07-19 20:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec2075affcae495f469734a10ea85e5d SHA-1: 29233349fc8370887f129ebd9a185e63fad5ea45 SHA-256: 6e3f51eacb5d44147c3a2097f48c4e46616462c7de841cb80108067bcd9ddc2c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URI that leads to a URL which, while currently marked as benign, is part of a pattern often used in phishing lures. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of the embedded URI and the ClamAV detection strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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/razvivatel/yapz/~3/pL_UGxDroB4/square?utm_term=beck+depression+scale
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e883dc37083541b5f623/1625876611805/comedy_of_manners_in_english_literature.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed570a4918f36a6d5f1242/1626167050089/convert_different_files_to.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_off0000f062.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16792 bytes
font_01_sfnt_off00010879.bin
4cde9d6edaadc11edfc8dfc9f8821bb8418fb284e28cefc144665edb3665a5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 10552 bytes
font_02_sfnt_off00012090.bin
2859a136894cb548a342d8e43adc4377ed8a1062bd487d62e64b7eaa8c6c7cd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 17132 bytes

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