Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d6d2e17105feb5…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 16:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4bbfb122e0d385f410d7c1d84562d6cd SHA-1: 52da22df947a15d6618193ffaea4affc429ddcc7 SHA-256: c8d6d2e17105feb5db69ae42841b01e3eb9a877db824abb0dc24db4021944599
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious content, potentially for credential harvesting or further payload 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://soxebez.ru/123?utm_term=algebra+1+practice+problems+and+answers PDF link annotation
    • http://kazexajisodibu.medianewsonline.com/40182400753.pdfIn PDF document text
    • http://nekimul.22web.org/jejiwazagiralopadez.pdfIn PDF document text
    • http://jinobuzid.scienceontheweb.net/nsfas_application_form_2020_nwu.pdfIn PDF document text
    • http://rikumoturukeju.iblogger.org/xiwisivafewovidikapikuk.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/lidejozijuvazadojabol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499319/normal_5ff5fa8973209.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/64717242431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_601d91e2cb461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fedaa9b4f503.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/86569526522.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/47691121397.pdfIn PDF document text
    • http://kejumazinanu.mywebcommunity.org/44903263987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_60257007eb65a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_6003dc5696caa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dozopedatofol.atwebpages.com/how_to_use_a_mantis_tiller.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/french_english_dictionary_download.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/36111512137.pdfIn PDF document text
    • http://vidavizulovox.rf.gd/tatunerosopajavegopomiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/what_is_food_waste_mixed_with_water.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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 5668 bytes
SHA-256: 28bbe269a545367e9a551dec900f15d018b0ac0482d67e1f3c66a64e80ca165a
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 11716 bytes
SHA-256: ea1f68e1d96d9da2b1f9e51a2d95c643328d11c7d81d8264d3c7883e11d61746

Open this report in the interactive analyzer, or submit your own file for analysis.