Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46f7d9d3d7b272a…

MALICIOUS

PDF

89.3 KB Created: 2021-03-21 01:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4941ca1991cfd7e4f1d2e40720df3ecc SHA-1: a3547e4b8c64b0929f849122259750ffa588f054 SHA-256: b46f7d9d3d7b272ae740ceb8dc7c5fc4e7e1c3b9e26ced4b0039b0a0eec40b75
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm. The presence of external URIs and the overall structure suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+do+you+write+a+personal+leadership+philosophy PDF link annotation
    • http://antonioit.fun/74726223437p1jz6.pdfIn PDF document text
    • http://complect-tech.ru/249779022849z32d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_60544b0f56e6d.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/TWK0mhj/95702869149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_6038145e22122.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/ichjVhS/how_to_write_a_business_proposal_letter_sample.pdfIn PDF document text
    • http://znalomstvavip.site/himnos_dela_iglesia_de_jesucristo_delos_santos_de_los_ltimos_das_en_espaolfx45o.pdfIn PDF document text
    • http://pornbustyvids.com/dotizgow30.pdfIn PDF document text
    • http://options.expert/how_to_thread_a_singer_stylist_776_sewing_machinek3xuy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fccbdd2553c6.pdfIn PDF document text
    • http://app-3null.com/959863186982udfu.pdfIn PDF document text
    • https://cdn.sqhk.co/dasupejej/gcjgIud/freezing_point_depression_experiment_lab_report.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/71412f42-2df3-4e6e-b935-cb5d2f57a75a/58385405707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837dd2bc-9ec6-4572-a135-5fe562a7a990/mulberry_fork_wma_2019_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a05240e-59ce-44e9-8b3e-7ae236c4e2e6/bissell_pet_stain_eraser_deluxe_cordless_portable_carpet_cleaner_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fdcb9c-bc41-4157-9542-e77a99bf57f3/pejelaxasiwenid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2222389b-821a-4e44-b934-26be4b265dc0/91954880378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d217a6e3-b0eb-4164-b14b-df8c0c08832c/vologazemabunedaregepix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54ac122-7761-409c-ac60-5e380fec000f/wenovanidikidorovugewov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d3c359-0885-494f-bf06-09307cc94a2c/97158131343.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_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 5200 bytes
SHA-256: cb9e689ec21e0baada84c1bd1edfe549d1d21f1f2c785ea827d4d701cf0c6a0c
font_01_sfnt_off00013063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13063 11620 bytes
SHA-256: 239512fa49b0c19f84621500c6039ad7ef0e5130c0352068e9b52d13194c7fdf

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