Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66689ff797ffb08…

MALICIOUS

PDF

71.7 KB Created: 2021-01-16 23:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: db53528cc9682f052b7da51b3a4b739e SHA-1: e9ac4e6168ed61573e2dfec39d3d30341424e651 SHA-256: d66689ff797ffb083d6c0212030fe174e338c56077e04f74333c0cf68cd89a74
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate an attempt to redirect users to potentially harmful content, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/123?utm_term=woodworking+merit+badge+project+ideas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473052/normal_5fe0c002184bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_5fa733be6033d.pdfIn PDF document text
    • https://cdn.sqhk.co/lofujumixas/gyigzig/car_price_calculator_pakwheels.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5ff0363aa3d0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463794/normal_5fcf1e351ed4c.pdfIn PDF document text
    • https://cdn.sqhk.co/dorusafe/uFjaiiC/how_to_fix_virus_on_iphone_7.pdfIn PDF document text
    • https://temegefa.weebly.com/uploads/1/3/4/5/134583031/14175fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369493/normal_5fce3ebf97901.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/silubebebefuju/championship_manager_2008_full_game.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/xizozajamatajuviren.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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 5748 bytes
SHA-256: b26d7f2d61a705bd88cca0a35ef2757751eadd24abafab2dfe222632e63b13a1
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 10384 bytes
SHA-256: 0483f082f8d583fecdb5445b6ddae28c87d33279dcf98c477936333577fba165