Malicious PDF — malware analysis report

Static analysis result for SHA-256 640251cf1091afb3…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 17:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77903ac032474f9a154ae80ad223a9e1 SHA-1: b9bcbb62024688e1baea1f2cb18d0369c5161193 SHA-256: 640251cf1091afb3875b323e838bccce302833498e95e474e17ee0d326510198
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the structure and numerous URLs suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/award?keyword=nematode+parasites+of+vertebrates+pdf PDF link annotation
    • http://vevufilusik.scienceontheweb.net/how_to_install_netflix_on_sony_blu_ray_player.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/978f3c.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/ccnp_routing_and_switching_todd_lammle_free_download.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/ectomorph_bulking_workout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_600a59b821e5c.pdfIn PDF document text
    • https://sarisiwubaj.weebly.com/uploads/1/3/0/7/130739508/xamovovebipow_gebikavejugid_pojojikaxen_xubadosazareted.pdfIn PDF document text
    • https://notususapi.weebly.com/uploads/1/3/4/0/134012365/pozefifinulopiwubixo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369911/normal_6004171a5fa80.pdfIn PDF document text
    • https://natapoja.weebly.com/uploads/1/3/0/8/130813782/mozepezilokaku.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/bibupefa_pejitevejuxa.pdfIn PDF document text
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/xavuvo.pdfIn PDF document text
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/ladituwexaf-lawexeme-jeped.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/95643566088.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/da8762763a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_c40a4c09e4a44290aaa2d1e7b656dead.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_e0489fea7a9c4d11acb9f3cd66263c23.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_b487ecf6a8a249fc937ce4305fe67673.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_7cc063c4c782488da113b92917cd92b6.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_036def081087454cb11a8e3e6dbb852e.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_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 5324 bytes
SHA-256: 0254821951b1f1f92d91aca51b13449751f62c9ef4ae3b5efd47b15042eeda1c
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 10936 bytes
SHA-256: a943d9f74e4cdb3a80278527cd89b9d0ddca9fc3a35f9f9475aea3a09d06f51c