Malicious PDF — malware analysis report

Static analysis result for SHA-256 98601350c6a13783…

MALICIOUS

PDF

88.7 KB Created: 2020-11-25 20:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 61c6232ea4bdeadb440ddc116468946b SHA-1: dc06b4c346c2ad02e2a2982c6eba507604ffc3a2 SHA-256: 98601350c6a13783c41f81bd99cb59bdf93be94018cd95c4343210775d8f94b4
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a mass of external links generated for SEO purposes. One of the primary external URIs extracted is 'https://trafffe.ru/strik?utm_term=presidentes+de+ecuador', which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=presidentes+de+ecuador PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472216/normal_5fa809ea1bfd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_5fa8c87ce2ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_5f96a2dfec9a3.pdfIn PDF document text
    • https://nuzewotamomumaf.weebly.com/uploads/1/3/4/7/134701518/ponam.pdfIn PDF document text
    • https://wiwajefe.weebly.com/uploads/1/3/4/6/134676348/8267850.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/sugowubuf/projet_d_agriculture_durable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d66e40-5084-41a3-be16-143d9bf5e278/real_number_system_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad14c612-e09e-4364-8f8c-53e47558a7a9/kemasuvekiz.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/non_governmental_organisations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f0a0c2-015f-480b-b9f1-67e7e6e6953b/15597379355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc041e0-aa0d-4a93-840e-5d6b8985f46d/1260192431.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/93974651264.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/shawn_mendes_houston.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/valley_ridge_elementary.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/wezanojimibilidesowosemu.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_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 4900 bytes
SHA-256: 78f40878202ae4128bb0d3ba2e69006353c5f3af6382850fedfcad73c77c9a73
font_01_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 1592 bytes
SHA-256: 3a91dab0430f10a8085c867136d39e07b5d74bc0754d2710a47c7589dcb3de5d
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 17136 bytes
SHA-256: ae715ceb539a28f9d78569ed44e6e445846825969af3f420ff1d7b63b4e29751

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