Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4759213efb5561…

MALICIOUS

PDF

79.1 KB Created: 2020-12-30 13:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 21caaffb9b553fc1df92908fb40f077e SHA-1: 8505790752d3c2f4d7c4b1db19ea409dc0a10734 SHA-256: 9f4759213efb55612d4ad9f66f82f09d8bb329351d1f8d8240a75a0834ef1f59
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 hosting and employing UTM parameters, indicative of a link farm designed to obscure malicious destinations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://trafffi.ru/strik?utm_term=word+games+online+unblocked' strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://trafffi.ru/strik?utm_term=word+games+online+unblocked PDF link annotation
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/4985440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415935/normal_5fe0c23c4d003.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/NjghhGm/27340402161.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/1910508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5fa6426a8a090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5fb73ed0d606b.pdfIn PDF document text
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/wujolaka-dakejudetowiw-nalukuduke-sajozafukoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f89d92dd10e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1870f7f0-8209-498c-b6c2-b7a1fa36bf08/android_9_pie_samsung_j5_prime.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/ciencias_formales_y_fcticas.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/bluecoat_academy_uniform_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/car_test_questions_and_answers.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_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 5476 bytes
SHA-256: cd7958faee10575c9d7dadbcc74653b7623bd49239d0c24573f223f0eea59dcd
font_01_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 10264 bytes
SHA-256: 3da89dca68c36b430793ccc8aa84da5f5e190ee62a1c86964bdaede45f457c50

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