Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fb0f25865d4458…

MALICIOUS

PDF

74.0 KB Created: 2020-12-20 10:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f113c4dccbecee511afa7f9f488ed803 SHA-1: 0468c243a86c915b33b69494c15a2120d90c8551 SHA-256: 55fb0f25865d4458a19a79fed9220b885662314dc6cf01a257a384903c4b1fbd
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, 'trafffe.ru', which is likely used for phishing or to host a secondary payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Battlestar galactica toy commercial', suggesting a potential lure or theme for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=battlestar+galactica+toy+commercial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5fb8826287bb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/84389905750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ba6e65-2822-4ba7-8841-4c0bd3594bc4/10140555680.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/zixoxuzawitopegesovanura.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a7b4e98326c0206a758/1606371965060/dolifavola.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77ace717a0f60c4039b47/t/5fcfe7d35fa26f4a9ee47b79/1607460821389/77210674724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a78e08-d12f-4572-a7eb-5cf500a02d98/82415284510.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/chunky_black_platform_shoes_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cd02d2-e2c5-4430-b364-da096aa405bc/supowagexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de6a20c-4dea-48df-be1b-5dfb28e59395/paper_towns_part_1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5272 bytes
SHA-256: a0d9e2224336a2c99854e75635f832bf68618cbb222fd541fbc9a3109cc3bb9b
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 11172 bytes
SHA-256: ebd4c9c399967f5d6bea63499a81393c1ecd08eb5997ae77d0b07b53c732be06