Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8418d2f1a969f3d…

MALICIOUS

PDF

79.2 KB Created: 2021-07-13 11:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cb219e2bc75d83a4c8fb3926450ed97 SHA-1: c3a77a0a39b187711ce54e1f7ad4d83ce20ae5fa SHA-256: a8418d2f1a969f3dab399f82c544b91fdb3e67ec640fba3d5a3cad4d3a3e996f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The PDF contains an embedded URI pointing to a suspicious domain, likely intended for phishing. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.1658

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://wastran.ru/square?utm_term=the+125+best+brain+teasers+of+all+time+pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7cfd04b964f05b847bf3a/1625804753044/41680292073.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec98a5f91837287388b31c/1626118309774/35264669134.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_off0000d273.bin
ab09e90deda296ff6182bb4321092d69b83016bc37fa6662d5f89b3ff9b8dfe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 11172 bytes
font_01_sfnt_off0000ec45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 16792 bytes
font_02_sfnt_off00010457.bin
49e7adbfba671fd20c87c6e189d6ae596ce5907388d0eed01f41417ffabfb718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 17060 bytes

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