Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d632725e0752a1…

MALICIOUS

PDF

83.1 KB Created: 2020-11-13 19:09:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5371b3d9df0d62a35297d0aa39457891 SHA-1: 1ab50ab7a1259388216cbeb14fed276c1eaf3108 SHA-256: 12d632725e0752a1d1eb5a6abde81af733ab29d50d779963bdcd73282053bf7e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed to redirect users to other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=hand+of+vecna+3.5+stats PDF link annotation
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/tiwovumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fae4aa1db205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5fa53fc3e6cd3.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/vokeri/borrow_and_lend_difference.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/free_weight_training_programs.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/tapusuremisawib.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/wakafogedugudaduxukibe.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/metesudawejevofirevotes.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/68378131190.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/mevirizaduruzidekuragugej.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/60883360719.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/fuzezibiwufuveliwe.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/absolute_value_inequalities_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/budget_highlights_2018-_19.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_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 5228 bytes
SHA-256: 8e7e97aeb20f49db930e1d2e8744e9ef44f484cdbd912a744963f437c614d74a
font_01_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 11464 bytes
SHA-256: 1fcd6f7073ab20ff9126270dc5f2278ecd6ea26e6e9e401c5950d91faf8c255c

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