Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81b76be432eb6e3…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 23:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 205428166c5f5a8bd0b0c9e877999575 SHA-1: 11263182b27346978777497e2beb305a95b6fa96 SHA-256: b81b76be432eb6e38dc645b1c649628499cfc56811a5868d77c51a75a2700e16
126 Risk Score

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://bologen.ru/wb?keyword=who%20really%20invented%20the%20lightbulb%20black%20man PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392659/normal_6034367b6b85c.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/average_salary_for_graphic_designer_in_chicago.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/17022840783.pdfIn PDF document text
    • http://fevajubinijexaz.iblogger.org/febrile_neutropenia_guidelines_2017_idsa.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/vBXih6o/arkadelphia_ak_weather.pdfIn PDF document text
    • https://cdn.sqhk.co/rojawamusula/mhhvifP/castle_wars_fairy_ring_code.pdfIn PDF document text
    • https://nujuwededewomoj.weebly.com/uploads/1/3/4/3/134305400/5581371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468536/normal_5fcdffc36f066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fcc71ffb6bb3.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/where_are_the_tropical_rainforest_located_in_india.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_6013680013559.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litorow.myartsonline.com/55610112146.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/archeage_unchained_lvl_30_guide.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/96484124840.pdfIn PDF document text
    • http://muzokusadozejog.epizy.com/why_is_my_new_frigidaire_refrigerator_not_cooling.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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 5556 bytes
SHA-256: 7da9b0d0f1b7a22cc224550e273caad8dd6c2da86e665e239907b86fd6a1a910
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 10564 bytes
SHA-256: 2261bdd700a8e879aace75e5e9854befd5e843f4d8c671aee9e4c099aa148527