Malicious PDF — malware analysis report

Static analysis result for SHA-256 a281da640bfbbaf9…

MALICIOUS

PDF

72.4 KB Created: 2021-03-10 18:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e056711b0ebdd3d26145ad4450447ab9 SHA-1: cdd49a3fc201d2483f7a829c0670046ff2aff49d SHA-256: a281da640bfbbaf9d6d7c7e5d2802fcc6891be7e3ba3004f62c174b439e3d913
186 Risk Score

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://resalured.ru/wix?keyword=dcpo+nko+pretest+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454286/normal_602ea7465d6a8.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/koxixivexoza-futopasegoj.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/fekas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475716/normal_60020c5ed2b64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_5fd788fecc220.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_020a340cc7f24139b17e7da9a36ca29f.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_fee3a482d5ed4a259bada31205e92242.pdf?index=trueIn PDF document text
    • http://pejemevogoge.myartsonline.com/archeological_anthropology.pdfIn PDF document text
    • http://xojifelogumexe.rf.gd/14983059324.pdfIn PDF document text
    • http://tulutubuvidimo.epizy.com/jizavij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176f0df9-78f6-49d4-89d1-a8db4d985508/isaac_asimov_foundation_series_book_order.pdfIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_e037be94d5fb402bbd62428c232cae78.pdf?index=trueIn PDF document text
    • http://zefefudu.rf.gd/siponiraru.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/karedeparaxama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e00d5f0-2f1d-428f-beda-a806f4526a88/vurawepimijebutawotizegu.pdfIn PDF document text
    • http://sisawujeza.rf.gd/introductory_mathematical_analysis_14th_edition_solutions.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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 5048 bytes
SHA-256: 3d8d541b7d4a1cd975030dda8b554e4f18f00489d2f1d4eeb44ee7bb798f8764
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 10144 bytes
SHA-256: 789a3f3b0b81cc8eb2fe222160778e81c0f1c30df7d3c78b17af6eee405834bd

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