Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bbd379a4c00107…

MALICIOUS

PDF

66.5 KB Created: 2020-11-14 03:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 89161cf8f209f42ec89b9e32bc2cc7af SHA-1: 311675df7df8af32c17d250b15ce0cde925bd6fb SHA-256: b0bbd379a4c001074be45f64eeb3e419a0d467654fc3212e1a4489bfb8b86638
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to various websites, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/aws?utm_term=search+picture+google+android PDF link annotation
    • https://jabezenenadako.weebly.com/uploads/1/3/4/2/134234778/nojezoverabuj-mejezo-pebebukezowilog-pepenosujafux.pdfIn PDF document text
    • https://supidopize.weebly.com/uploads/1/3/4/5/134521205/0be219b8.pdfIn PDF document text
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/9856851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f8988980d474.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/3162347.pdfIn PDF document text
    • https://lazetulomobepi.weebly.com/uploads/1/3/4/3/134326787/gedelisevex-tesolupeka-nowafa.pdfIn PDF document text
    • https://teguzefememefa.weebly.com/uploads/1/3/4/6/134609716/kupotig-domipe-ratudoxe-lurupitoniwu.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/9461a.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/2795217.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/wunojipu/projectile_motion_simulation_lab_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/78016935701.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/skype_7._35.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_off0000c7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B9 5260 bytes
SHA-256: 7f3213e00d73016f3e6e56882bda7328bbe1067596ef540be8b99c5b503e5e8d
font_01_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 10540 bytes
SHA-256: 406fdb68a7aafc169144e78aa395553a7747a6267c43734612df7a28d3268cd0

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