Malicious PDF — malware analysis report

Static analysis result for SHA-256 4082509be2b3661a…

MALICIOUS

PDF

86.4 KB Created: 2021-02-26 03:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ee374907188eaae172b9aa9253152cf SHA-1: 0a525d1ea90fa845a127ad70295c940059a9ddba SHA-256: 4082509be2b3661ae9647f8b6a3ff46941739a50e4769889ec7a3d1d25b53ef6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and are associated with redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or scam attempt. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=assistant+educational+psychology+jobs+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459176/normal_601488e0a9adc.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/top_10_photography_tips_for_beginners.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/why_engine_service_soon_light_is_on.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_5fe6d16c169fa.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/gii3QVV/lagovevug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fcacb14943e3.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/B0Fihif/body_scanner_good_during_pregnancy.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/hhtwhiY/51977146897.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/how_to_measure_the_chainsaw_bar_length.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/87015327272.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/ezn8Xdl/cheapest_flights_to_san_francisco_from_london.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_602b6bc17eb6a.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/sivedejopukuretuv.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/how_to_get_a_baseball_bat_in_gta_5_online_xbox_one_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480905/normal_5ff10d91d7968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutexuvidag.myartsonline.com/mustang_2070_skid_steer_parts_manual.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_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 5612 bytes
SHA-256: 1eebd93af571217bf26c46923ba38483cab76c66e2d6b90492a6408641fa0eba
font_01_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 10856 bytes
SHA-256: 304a7b4016fc5b4247f830c7d12a35cd22064e850e4c98bff9ea6f3382da37be

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