Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc33a8ad846281e…

MALICIOUS

PDF

92.6 KB Created: 2021-04-03 11:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4c31f15412d104f6630aefa449f17498 SHA-1: ab406fc75770beb839c2fce657d101ef2630a96d SHA-256: 6dc33a8ad846281e4636c93a9d6ccac5f2e8765fbb5bffb8e49f123f1e4f3587
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or SEO poisoning campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

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://lozipotod.ru/aws?utm_term=star+trek+enterprise+season+2+episode+14+cast PDF link annotation
    • https://cdn.sqhk.co/korebuxaguz/icI2hf5/82301078797.pdfIn PDF document text
    • http://torchqbfl.fun/74303983352l5u1a.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/collateralized_mortgage_obligations_structures_and_analysis.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/brother_mfc-7340_ink_refill7wl8u.pdfIn PDF document text
    • http://mimiluzaxapurum.22web.org/admission_form_template_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxumududu/MOO5jjx/63148012928.pdfIn PDF document text
    • http://tapabafana.22web.org/ralinegopetekonuf.pdfIn PDF document text
    • http://prizinsta365.website/58039387969fwtwm.pdfIn PDF document text
    • http://tujomof.22web.org/jezikixikavovivegeje.pdfIn PDF document text
    • http://banki-internetowe.com/zatezu92b27.pdfIn PDF document text
    • http://bluebadge-support.com/hand_drill_tarkov_valueod5pe.pdfIn PDF document text
    • http://sfhgfje5df.xyz/que_funcion_cumple_el_sistema_endocrino_en_los_animaleszxhbm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_363a4c6e6e754dc3bd5bce72525b7d99.pdf?index=trueIn PDF document text
    • http://jolasesiv.epizy.com/75797609076.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_36155ae7486b446896cb97c4aacddb0b.pdf?index=trueIn PDF document text
    • http://lojosikol.epizy.com/troy_bilt_rototiller_horse_for_sale.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_45a8f39548684ea8955d9433c4f5ca6a.pdf?index=trueIn PDF document text
    • http://potelodifudoduj.epizy.com/bujipevojuvowusob.pdfIn PDF document text
    • http://ruzowedomox.epizy.com/3550028891.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 5264 bytes
SHA-256: f7a69b8a827f1236bce86f58b881b32cf4f4fbff28d659d934fcc0bb1735928e
font_01_sfnt_off000131cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CF 10848 bytes
SHA-256: dab8ef6efd6aefb8da6b4eb7fbe2f2217b45ac2a80ca6af437f672beb96e7486
font_02_sfnt_off000156bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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