Malicious PDF — malware analysis report

Static analysis result for SHA-256 c334e75b9b1ddece…

MALICIOUS

PDF

71.7 KB Created: 2021-02-22 04:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a970c1f3ba8816db91669a953815281e SHA-1: e60ff0176c25356e65bfdc54a24d5d38b97a765f SHA-256: c334e75b9b1ddece3e157d309663b0ed8ded87649903eed204489de50d133024
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=external+speakers+don%2527t+work+windows+7 In PDF document text
    • http://bostpolamos.site/28685639746eyaqi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444623/normal_5fe5455b6e180.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/4217fcd149c06.pdfIn PDF document text
    • http://iranianvc.com/60931374252nh31e.pdfIn PDF document text
    • https://nexojirinetu.weebly.com/uploads/1/3/1/1/131164364/vuperenosidi_vosazefenadu_rapok_farow.pdfIn PDF document text
    • http://bufo.online/78785080386sopb8.pdfIn PDF document text
    • http://fitness1.space/whistle_song_kill_billrv9mz.pdfIn PDF document text
    • http://discout.online/rizasaponin59rzv.pdfIn PDF document text
    • http://naturebiolog.space/beats_earphones_owners_manualf90gp.pdfIn PDF document text
    • http://springwin.space/91087863372wjf5g.pdfIn PDF document text
    • http://ens-pictures.ru/nakinirisebizibx4s01.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/idhdVJ4/3d_flip_clock_weather_premium.pdfIn PDF document text
    • http://bonusiotsbera.online/cartas_desde_el_infierno_librouttvk.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/c6hfM0k/78886795320.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/wYQggjh/rupebutabi.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/kawugavibis-towupid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 5248 bytes
SHA-256: 1f4b2931689849d3242241c88ef3e842da2b8daa87ec20f444fc81928609b519
font_01_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 10628 bytes
SHA-256: c764d368cb813717b537ea894fdf629633b2ccdef0daaa4e268d9c5683204769

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