Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3da0efb387ab1c…

MALICIOUS

PDF

85.5 KB Created: 2021-03-23 21:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c707ad56571191587d63d1680b2bed4d SHA-1: 412018b3a096fa46885527f0f76518c8971ac98d SHA-256: 4d3da0efb387ab1cd4ba50a4da522a507ec500937faa3deb8b4853cbefe58872
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to potentially malicious domains, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to phishing or malware-hosting sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wix?keyword=burnout+paradise+car+guide PDF link annotation
    • http://iminn.ru/multiplying_fraction_worksheets_5th_gradejjwjd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_6036d353edac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_6028e248a75b4.pdfIn PDF document text
    • http://astrology-personal.online/fizulapetakinitirodedufn00rf.pdfIn PDF document text
    • http://coloradocustomelectric.com/rational_male_reviews3cyea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_6022e18330dce.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/joint_venture_agreement_forms.pdfIn PDF document text
    • http://martans.space/z_for_zachariah_ending_what_happened_to_caleb4lrfv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_600a9106ec37d.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/business_plan_for_briquette_making.pdfIn PDF document text
    • http://botefin.medianewsonline.com/79982117199.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/gipepok.pdfIn PDF document text
    • http://opsnatur.fun/metro_rail_map_los_angelesa6b41.pdfIn PDF document text
    • http://ledimpress.biz/38543996987ldt5l.pdfIn PDF document text
    • http://navalny.design/8th_district_court_vernal_utahzitfg.pdfIn PDF document text
    • http://fruct.space/what_is_daphnia_heart_ratezrk3y.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/questions_for_lord_of_the_flies_chapter_12.pdfIn PDF document text
    • http://raftgjgr.space/xugafaletudez5d8s.pdfIn PDF document text
    • http://instapresent.site/braille_code_worksheetzzqsj.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/pezofut/49660087517.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/wemitud.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/ldap_commands_in_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/61553086787.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/wufas.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_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 5256 bytes
SHA-256: ce6d8edafc5a1ceae98a45ea17f3a6a05e41a2f67f63964346bf2419d22d3816
font_01_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 10656 bytes
SHA-256: 2fe8e367f0f3d9367f40e7864b7bdda7d17f92297806d0aa68b976c70c88f8f9

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