Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f417b052250c66…

MALICIOUS

PDF

70.3 KB Created: 2020-11-18 12:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 786a15e34769a5f6186b9364661140a7 SHA-1: 551c95d98303b169c65802b50315a3426dac4c14 SHA-256: 05f417b052250c664a01e0bf701234bfed73ce5ae7ac79a015b1d1aaac331147
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=regle+du+jeu+tock
    • https://mapupuvegov.weebly.com/uploads/1/3/4/7/134712300/birezigonosire-xedefubuwu.pdf
    • https://cdn-cms.f-static.net/uploads/4426060/normal_5f9812398e819.pdf
    • https://foravozivosuwu.weebly.com/uploads/1/3/4/0/134042788/daketuji.pdf
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f8b3162d95ec.pdf
    • https://sagoxanoku.weebly.com/uploads/1/3/4/3/134350044/wonakixazubopilire.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/nagobedari.pdf
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/dunaxajesiwedok.pdf
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/rixunapokulobivukeve.pdf
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f925140df7e7.pdf
    • https://cdn-cms.f-static.net/uploads/4444636/normal_5fa131ab7483d.pdf
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/4377800.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/241ca3ec-273d-4083-828e-8dfe317d80aa/emirates_mission_statement.pdf
    • https://uploads.strikinglycdn.com/files/542d3d5c-da75-4bac-86b0-1e9d16dadc93/lifegovuxulazibevowazaxen.pdf
    • https://uploads.strikinglycdn.com/files/de80d210-9431-4a12-a2aa-1e191701652d/14459896063.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67c.bin
d549603bf5d489d8de21ef154730cb056ce6ee7775b9e24a5d6a0ad226450b48
pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 4772 bytes
font_01_sfnt_off0000e6dd.bin
ae9e37e31bacc4e058ce48ec671184d3975046d36b745da8c24a72a3856dabcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 11612 bytes