Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be0ede8eab177cf…

MALICIOUS

PDF

105.9 KB Created: 2021-05-02 11:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6237115736e10f6d8514c587defefa4e SHA-1: df2594f11a80a5274d23f34eab1b34eda8199001 SHA-256: 4be0ede8eab177cf594cb286ebffc5a08caf46d80320b64fe901675d0b11c22c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=best+sole+elliptical+for+home+use PDF link annotation
    • http://paruxezogu.mygamesonline.org/que_tus_ojos_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6044cd59aa26a.pdfIn PDF document text
    • http://faceit.su/86727926954brp69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_606d009956e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_602396867cbcf.pdfIn PDF document text
    • http://reduslimitalia-official.website/porque_cuando_como_me_da_mareo1dmph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_606039949b3b7.pdfIn PDF document text
    • http://krokoboko6.xyz/how_to_change_time_on_briggs_and_stratton5pzqm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_602ad0de93409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_600149c3c8d58.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/dell_precision_m4800_price_in_pakistan6r03b.pdfIn PDF document text
    • http://folejaf.mypressonline.com/24674277622.pdfIn PDF document text
    • http://naturmilans.fun/calicut_university_distance_education_id_card33w33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/welumigepowavizutebuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769acf5f-7a40-42af-a721-65efa13bcea3/5377149179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92b678b-fcde-458e-a28e-94df600fb31c/fopomizawolazumafezupet.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_off0001617a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617A 5304 bytes
SHA-256: 9fef3450bb4e10f399ece406e7971c560e1bb4e1f434f6f142261bf4783b0397
font_01_sfnt_off0001735f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1735F 11276 bytes
SHA-256: a0957d43320ff420c934a2e84e3175bcc5ccd4310562ba31580ba8b8365c3ba1

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