Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b62289c12d25a20…

MALICIOUS

PDF

69.1 KB Created: 2021-06-11 02:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d99c0f0d92d556d4a9887e3e60cce15e SHA-1: 2b14e95defd3578ca6afcfa057ef8bada4bb92ac SHA-256: 1b62289c12d25a20c643ff6c91722fe7da55538c41be4199a6e2aa41c3a0e6fc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://laborke.ru/pbw?utm_term=keygen+autocad+lt+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5ff422eaabe50.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/busizagajewepef_wodujefiwedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_601b44e81d4ce.pdfIn PDF document text
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/wulifavuroj.pdfIn PDF document text
    • https://namikefazexu.weebly.com/uploads/1/3/1/6/131606603/7242787.pdfIn PDF document text
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/jigakag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_60278eb9dc43e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_6022e2dcaa4ec.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/bugosijuvevikuk-burisikifinido-betumutijuvof-teput.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/zodavol-zodajaxemakij-kifirakuwosem-fidatuwiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474205/normal_6037d548b6760.pdfIn PDF document text
    • https://somusepuxe.weebly.com/uploads/1/3/1/0/131070447/abf4a07aebe9653.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karulimomaw.pbworks.com/w/file/fetch/144848571/why_is_my_poulan_chainsaw_leaking_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e8382d-9733-4766-ac16-917b5cdbefec/chemistry_laboratory_report_format.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/what_is_the_purpose_of_the_bobo_doll_experiment.pdfIn PDF document text
    • http://buluwogot.pbworks.com/f/nmeros_ganadores_del_mega_million_de_hoy_viernes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d059c228-3831-49f1-80b8-595a60d69ccb/how_to_answer_interview_questions_about_customer_service.pdfIn PDF document text
    • http://gitizuxob.pbworks.com/f/examples_of_conflict_resolution_for_interview.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144423993/riganugate.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_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 5180 bytes
SHA-256: 670ba9868732ecf5ec9e1884a2e0408461698c9f4bae201298f56887f5e18614
font_01_sfnt_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 10648 bytes
SHA-256: 31e2ca43368bbad4a13e465147c70aee990454f4288def2ae077453011918623

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