Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e2bebdc9250459…

MALICIOUS

PDF

72.8 KB Created: 2020-11-10 09:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e74d3efbd501557f989693fee51bcc01 SHA-1: 28867dede03b7b8ea65b73ea4a91a3f588d3fb09 SHA-256: b1e2bebdc9250459c9af3e9f329b3bc8378407d8cc988f530c1b83b4c996fbce
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files with numeric or generic slugs, indicative of a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?keyword=probability+study+guide+answers
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/fovinulemutufejelawi.pdf
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/zeliwe.pdf
    • https://gofobodobade.weebly.com/uploads/1/3/4/4/134444694/63c001108206f1.pdf
    • https://xexogabowagub.weebly.com/uploads/1/3/4/4/134438270/nukesonero-fekovojag-divozomavumade-dodizobojok.pdf
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/getuwofadokedaw-fazolumelo-fojikaduwode-fivib.pdf
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/limovoda-giwadirev.pdf
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/11f75da2703b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3ff107bf-44f7-4f4c-a858-e1b2fa3aacab/luzuduzibinupamefesi.pdf
    • https://s3.amazonaws.com/zupenafud/ancient_near_east_texts.pdf
    • https://s3.amazonaws.com/wonoti/wediz.pdf
    • https://uploads.strikinglycdn.com/files/54e26e83-9a31-48b7-a9fa-04ce994d4209/71666467594.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_off0000dfa8.bin
ae7e6068590c9be728c2614527a944acbff8b75fd9f6cee91a9f66507e410b5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 5328 bytes
font_01_sfnt_off0000f1e5.bin
20879243435117b9109355894a77ffd0fdc63d85b28c72703e2d3b1a8cc10e4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 10776 bytes