Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f818917db8f3003…

MALICIOUS

PDF

71.2 KB Created: 2021-01-03 03:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 27c5ef11f28232e241b0a32ac64d1833 SHA-1: a537f24d21cb299f36354107ae2eaa67857fb05b SHA-256: 3f818917db8f30034e1a980d904bf0f25cff193dbc328591d5aaad1006a59045
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The PDF structure and embedded content suggest an attempt to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://trafficel.ru/aws?utm_term=kashmiri+naat+sharif+audio PDF link annotation
    • https://cdn.sqhk.co/pimidima/q4cicXd/pass_with_flying_colours_idiom_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dojonuta/kentucky_fried_chicken_recipe_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/xifonizilusu.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/81838980751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02043c2-7c0a-47c5-b07f-36c04bdb31e1/wejejegames.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2ab8cc-2a65-4072-b912-786e8c4f23ec/gowirijawugalowifujasu.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/lukonarinililodubikomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595f3c9e-e333-4960-b66c-a18d878d88a2/buviravuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6c02e0-b045-4964-abe7-04c93d0f86b3/87497358764.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 4848 bytes
SHA-256: 0af610690cf8f8f9c194620d915742d574bd40a6087022369785f34041ad671a
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 11048 bytes
SHA-256: d4a5680b9c8edb3f0ae4a8ec8222d0234a9757d07838e1a31ba2da7c128f112c
font_02_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3