Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead45d3806f694d9…

MALICIOUS

PDF

76.1 KB Created: 2021-03-06 13:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4b782e0072be71b9d5f5f119d8173a29 SHA-1: ab817394489d42532e7341719f85be231f57780d SHA-256: ead45d3806f694d9b4f02723df3825ba1662c46902bc7e7ad4e8be98b9443e55
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely the phishing landing page. The document body, though heavily obfuscated, appears to be a lure related to a book search, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wb?keyword=the%20outsider%20colin%20wilson%20amazon PDF link annotation
    • https://cdn.sqhk.co/meduxemij/mFPpfhj/movistar_colombia_pago_no_aplicado.pdfIn PDF document text
    • https://jepiweluzobadur.weebly.com/uploads/1/3/5/3/135300479/91aae37ac05e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412415/normal_600036be1e753.pdfIn PDF document text
    • https://mefuwowenapes.weebly.com/uploads/1/3/4/6/134611128/790051.pdfIn PDF document text
    • https://fujikoxeloto.weebly.com/uploads/1/3/5/3/135307408/1461c13fa8.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/mjjybgf/96785555093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_602385b40f99c.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/Cjjr3gd/nawilasuji.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/ihZjelm/47490263766.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/4460106708.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/what_is_hindi_meaning_of_inorganic_chemistry.pdfIn PDF document text
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/bd2e499b8307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5fe0de9d01b8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fe63dc32358a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_5fd727604397c.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/fRCv9EC/57625612464.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/zurozumonagiw.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/rolefosiju/65903358108.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/buputemakola.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/year_3_maths_sheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/medatamepuses.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/musalilomabikazomowuxunun.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/rekefagisirorateb.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_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5272 bytes
SHA-256: 2d50f8e08435065dac280a9e49ecabd3cda2e5e1e9cf32a2257eabafc5a30d46
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10260 bytes
SHA-256: 3b7de81421bef7f6cdffc2b001ce57b3d9c889bd62fe8ef8d601f95753b1938d

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