Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a9297c8d3e0a82…

MALICIOUS

PDF

74.2 KB Created: 2021-04-02 17:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 36b3351cc1c3c242e59211deff3a9ddf SHA-1: 63869f9aebeb2b5309e82ebbb593bd9e1d12c108 SHA-256: 33a9297c8d3e0a82b4d3a90a09e5a98287699b6f2d5d03a612bfacdf66b5a6ba
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to external sites, one of which is a link farm designed to host numerous documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to technical support queries, aligning with a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=how+do+i+reset+my+rinnai+infinity+26 PDF link annotation
    • https://cdn.sqhk.co/giwumazusew/iijaQth/construction_project_management_jobs_in_atlanta_ga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426942/normal_602d22eb44281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367923/normal_5fddb35063ce4.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/f73VNSd/the_ordinary_serum_for_dark_spots_and_acne.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5ff3c210b07c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_605e1a7a47d53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5ffd891b46990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fd3bbbc3d3c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fce2466da876.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/ahihaFw/nfl_logo_quizzes_hard.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/ggdAnHs/parler_stock_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_6a1d973b9d2845c8812f5da6a95c45d2.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_e8b747b4361a45998c01c8d5551f8061.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_6c52704143b647b183b5ba77339da7fb.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_1ef914134b464a00b99a5f16c9d92f25.pdf?index=trueIn PDF document text
    • http://vadezofoxamar.rf.gd/fifuxasulemezetaxefoxagod.pdfIn PDF document text
    • http://pifaramurul.rf.gd/how_to_know_what_kind_of_books_to_read.pdfIn PDF document text
    • http://xevupabiko.rf.gd/83419575828.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_def034ec4b924d6abca3f68717093788.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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 5464 bytes
SHA-256: 5bd1a3ccd235dee68d066f085add05473fc7952921ae5a2e009633b9476531e2
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 10808 bytes
SHA-256: 9601ebb6e0383cd1a038e6635ee7aa690d829186102dce637ea07582e183763f

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