Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91ec320ac18fbab…

MALICIOUS

PDF

69.1 KB Created: 2021-03-15 19:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e467134e6e6a6dde10dfec72a4a6fc84 SHA-1: 60382be0d9d0ff4b12e86c9f26bd6e2e4fbc6989 SHA-256: e91ec320ac18fbabec796d19d29bf0f685fb6bef0eff27c6ff799cd52463e23a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the heuristic firings point towards a tactic of redirecting users to potentially harmful websites.

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://nipisod.ru/strik?utm_term=where+to+service+a+smart+car PDF link annotation
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/lovudetulexiroku.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/031f4948389c9.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/94078010065.pdfIn PDF document text
    • http://murupewobot.iblogger.org/41694912785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_603a6101cc65e.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/xufazaxem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369190/normal_5ff51e4f116e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5fe95d551fea3.pdfIn PDF document text
    • http://kubamawowu.22web.org/81932297022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379852/normal_5ff3663ac3c67.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/mamul_lemubariwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489975/normal_6002a9c99a77d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojepizalek.rf.gd/75500746750.pdfIn PDF document text
    • http://malinaliwul.epizy.com/39305497380.pdfIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_1e87927f44e044ea8a92c8de8daf5a6c.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_34ccb7c957e84f2dba98ae7feb3785fb.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_ed125fe0b5af4388bad9d8261c6306c9.pdf?index=trueIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_5a1638097e6346fe9e565f38e6c04d3b.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_85ded2accf6b460bb85065c5aabc6d21.pdf?index=trueIn 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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 5080 bytes
SHA-256: 0f41f5c757a662d66c83cbcc2bee60503437d7b4a0db6881f1f07d6ccd109714
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 10476 bytes
SHA-256: b25fb3799d31cf44b115937821ed707af2f01b2b6dfd47f426f8ef51a2656106

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