Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b473b853ce3bc19…

MALICIOUS

PDF

75.3 KB Created: 2021-05-03 07:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ed253a2c8de15301138adfefe07d7a39 SHA-1: e3faa0065ef7766137b6c1c24c37973045defcab SHA-256: 6b473b853ce3bc191b664613f28d01f9d86f806154483b887bc4541711d0b1d4
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary one pointing to 'xajibur.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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://xajibur.ru/strik?utm_term=how+to+repair+cignal+remote+control PDF link annotation
    • https://petenugilamabo.weebly.com/uploads/1/3/1/4/131453278/8269404.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/gdtsBgh/19905677538.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/sPf4hbP/zombie_hunter_frontier_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • https://ruvawigalovenu.weebly.com/uploads/1/3/4/3/134318686/xevix.pdfIn PDF document text
    • http://copyrighthelpptteam.com/conflict_management_meaning_business8lgsq.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/hghghgp/battle_star_latest_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fetogivaw/cc7hhjd/pengertian_biota_laut.pdfIn PDF document text
    • http://optamorem.com/saxapukalemez4a.pdfIn PDF document text
    • http://kirunag.66ghz.com/petejiwefegawokopotalimag.pdfIn PDF document text
    • http://neuroncraft.online/kenmore_top_load_washer_does_not_spinajuy4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukujidor/zetamolaxafurepowiterek.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/lefagukesaginafu.pdfIn PDF document text
    • http://vawolanuxoreg.epizy.com/xemaxikosuz.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_ee40bef7f3e646fd8d6da21d089bc39a.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_ce8df344792b4a949aba0dd2374f2fbe.pdf?index=trueIn PDF document text
    • http://vavubal.epizy.com/blend_for_visual_studio_2020.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_f71a69777c024cd486fa04173da74a21.pdf?index=trueIn 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_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5128 bytes
SHA-256: 512f025823a8f7d23f0e7f235857a5a3c32ae2b67a13010a7806aebb50094165
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 11476 bytes
SHA-256: a259c7e8596de5fc1cd279e32cc82b7bb54e190c88a7d5f0fecf951ed3907301

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