Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab2b6a0216af2f0…

MALICIOUS

PDF

72.0 KB Created: 2021-07-13 09:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72dcce646ffece14541a0a158b7fbe0c SHA-1: 9fa05b3a8a34482ddfa31c46d6a84bc59c81e238 SHA-256: cab2b6a0216af2f093c1718b6297d8dc23ab41a24a23f97615820053ab4171a8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URI pointing to a URL that, while currently benign, is likely part of a lure. The PDF structure itself is complex, with duplicate object bodies, suggesting obfuscation. No scripts were extracted, but the presence of embedded URIs and the ClamAV detection strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1869

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/W5vEtEh6t-A/square?utm_term=center+game+chess+opening
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e76fc8bfac8661220cca0e/1625780168983/quotes_from_chapter_5_lord_of_the_flies.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e95c0b3b7e7c633451f466/1625906187694/jaggery_for_health.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_off0000bc68.bin
57915cf71394e9f41d26ea51e6ee1f168a03732c24063b4bd33de92bf9c5025f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC68 15512 bytes
font_01_sfnt_off0000e3f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 16792 bytes
font_02_sfnt_off0000fc0f.bin
dc34b67c6e967e0a0e5cb37eeebf1885de34d846a66687f93b048b41ec0c6e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 10808 bytes

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