Malicious PDF — malware analysis report

Static analysis result for SHA-256 451499690eed0b7a…

MALICIOUS

PDF

91.1 KB Created: 2021-03-10 21:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fe17aab98e4462ed563f11be3cf98125 SHA-1: b3094b4d5e3e74b0be455afe72329c159867d6b1 SHA-256: 451499690eed0b7ae0e73409d9b8b57699e119e71c21e49a2068dbb9a0de423a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points to an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=faye+glenn+abdellah+nursing+theory+pdf PDF link annotation
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/c0bd1f43cd53a.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/human_anatomy_for_artists.pdfIn PDF document text
    • https://sijetiwiriwex.weebly.com/uploads/1/3/2/6/132683168/2156033.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/dell_inspiron_6400_windows_10_drivers.pdfIn PDF document text
    • https://zapeledi.weebly.com/uploads/1/3/5/3/135314532/2437363.pdfIn PDF document text
    • http://fabulouss.space/latuzapaduxavotupurijc9smq.pdfIn PDF document text
    • https://nebobaxewakizix.weebly.com/uploads/1/3/1/6/131637309/xetujibuwufilorefo.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/920546.pdfIn PDF document text
    • https://cdn.sqhk.co/vusabutam/gfpdDCX/forum_star_wars_galaxy_of_heroes_free.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/ramodobsckg8.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/eij0Er2/city_runner_stroller.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/H8tijjj/silver_dollar_city_schedule_for_november.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
    • http://dilutibu.onlinewebshop.net/pandoc_convert_latex_to.pdfIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_bc76d983bb57499c8142c29c7fbce7bb.pdf?index=trueIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_13657d48d88c4c059303c70ce4b804b4.pdf?index=trueIn PDF document text
    • http://nejesezape.myartsonline.com/sowetuwulopusobeli.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_3cddc5ac424845a2bb8318c558ed92ed.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_3224953cc50b41c8a96d8f8fe44d6d1f.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_8b7de725d7c94d75aa4b7049353a39d1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 5384 bytes
SHA-256: a5df47874be4e5f3dcaa59b99be7fbc6ee2e4a0ca04640e908e86c929e43537b
font_01_sfnt_off00012d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D86 10452 bytes
SHA-256: e651e163c6329158192ad7f4802485f0b750bc82ebeb1de664a549e08124e3ae
font_02_sfnt_off00015109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15109 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333