Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f2180441c419f4…

MALICIOUS

PDF

81.3 KB Created: 2021-03-06 03:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e32f21563a2047d06a6e7c7bc86be183 SHA-1: dce644be098ce2dfef6b6b647fd30cba98944962 SHA-256: 56f2180441c419f4fd1cb04391de24a23f43fa4687860ce5fb8798b4c95f8bf6
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to redirect users to malicious websites, as indicated by multiple heuristics and a high number of external links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user curiosity or trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=how+to+do+an+oil+treatment+with+monat PDF link annotation
    • http://kumululurug.scienceontheweb.net/pulabefolinevifofalu.pdfIn PDF document text
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/d3b7acf0.pdfIn PDF document text
    • http://fovagenifozemub.iblogger.org/relation_and_function_worksheet.pdfIn PDF document text
    • https://xamikike.weebly.com/uploads/1/3/1/4/131406211/likupuvoladowoxukov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fd1d429d4ddf.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/how_to_print_wirelessly_hp_deskjet_3755.pdfIn PDF document text
    • http://resezowuzotul.22web.org/30350914389.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/zukijeximazafakaso.pdfIn PDF document text
    • http://burasiwe.22web.org/uniform_convergence_on_bounded_sets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_602286c514975.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/guguf_kudowinefak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5fef3c6478f94.pdfIn PDF document text
    • https://tufulikuzusader.weebly.com/uploads/1/3/4/8/134866114/5088339.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nobubuti.rf.gd/clasificacin_de_funciones_algebraicas_y_trascendentales.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_43d5f0a37e4741c7b87c695e4e488fa8.pdf?index=trueIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_4e96bd538cca4deda4279d882337be52.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_226debd76bdc493ea446f42cf93250e0.pdf?index=trueIn PDF document text
    • http://finubovuputok.epizy.com/fasupuximigugudavosuvo.pdfIn PDF document text
    • http://takamuwemevofe.epizy.com/zoduxoweje.pdfIn PDF document text
    • http://tekoboworitutew.epizy.com/jubopogaredazun.pdfIn PDF document text
    • http://vivizegijarugip.epizy.com/business_card_maker_creator_premium_apk.pdfIn PDF document text
    • http://dojovosis.rf.gd/7634116223.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_c7269bc973734d908ae1d39dd252c0f5.pdf?index=trueIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_db380140cfb4421aaee87267deac191e.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_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 4940 bytes
SHA-256: 3716552a1c2f001ae04419a96492ec3347f761c5b93cbf8eed252b228bc4fbd8
font_01_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 10792 bytes
SHA-256: d86c22f27acc96996736e4c521fcc10de18f9edcaeeaac11dbae02978cecc3fe