Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f1b2a2f4af8561…

MALICIOUS

PDF

65.4 KB Created: 2020-12-04 18:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9428a9901df78b33f4ccd835fd679c13 SHA-1: 18b232a0626887309c1200da9784001b761667c8 SHA-256: 81f1b2a2f4af8561cae9c333d8b6fe66ce9d3b007cce7a766b58843a04250ede
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, with the primary malicious URL being traffset.ru, suggesting a link farm or phishing lure. The PDF structure and the presence of embedded links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/strik?utm_term=vitamins+and+minerals+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466666/normal_5fb7fad23e048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5f9c17da97cfe.pdfIn PDF document text
    • https://rupovopijono.weebly.com/uploads/1/3/4/8/134863796/ea4b43cfb9a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_5fbee3d590c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fbee11c8d854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5fbee31cefca6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ace31d-f830-46a1-82dc-7cdd4de2a625/87576653815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef224f21-20c6-4c02-9393-29a18ab519df/redeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4463a888-bd35-4054-9af0-dcc54242759b/jaid_black_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/22370768175.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/stihl_blower_br600_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/allahabad_high_court_ro_aro_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/75168942913.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_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 5212 bytes
SHA-256: b780398c1863c910c50d2bc88113ffeef4a44262cecaf187a4cef8cdf65b02d7
font_01_sfnt_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 10316 bytes
SHA-256: bdfcfe6e4803ac29332bfb149109d00a7208bd9e94d2494dede51ed8504fc3a6

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