Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07bb2813cdceb93…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 06:26:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3712ee4e6f15210fae1e8c794e77540c SHA-1: 2828682b516a44d456f77bdec9c78d03388f69c1 SHA-256: e07bb2813cdceb9312615d79cf30d59bf6f821f3f73fbc81d078b7b0dba8f970
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, with one prominent URL leading to a suspicious domain that appears to be part of a link farm. The document body, though heavily obfuscated, contains text related to network device configuration, likely serving as a lure. No scripts were extracted from this sample, but the presence of numerous external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=default+ip+address+for+netgear+router+wnr2000 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500883/normal_5feed6284b495.pdfIn PDF document text
    • http://zzzmmmmejjj.space/faderexunegorapezepuwfece9.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/perifexafujovijobaj.pdfIn PDF document text
    • http://kind-insta.site/vatonukodasiditezakotoou9qs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_6042f3f3d3218.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/dirt_devil_stick_vacuum_bags.pdfIn PDF document text
    • http://triple-doska6.club/how_to_cancel_adobe_subscription_on_mac4i06u.pdfIn PDF document text
    • http://tumugake.iblogger.org/dokisaxidideg.pdfIn PDF document text
    • http://ig-objectionform.com/best_table_topics_contest_questionscz494.pdfIn PDF document text
    • http://boomerangoo.site/malabar_biryani_recipe_in_malayalam0gi67.pdfIn PDF document text
    • http://my-favshopd.online/fiwibivasofgq9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_603325f5ccd69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_6023f0ea17669.pdfIn PDF document text
    • http://dektesheff.xyz/crazy_free_kick_mod_apkel3bf.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/antiepileptic_drugs_review.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://tajiroxajesolut.atwebpages.com/5468846053.pdfIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/pelavafojusofu.pdfIn PDF document text
    • http://jazopizebe.atwebpages.com/26255789355.pdfIn PDF document text
    • http://suwuriru.onlinewebshop.net/dd_beyond_spells_warlock.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/malaria_laboratory_diagnosis.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/kitutanazosekijabozone.pdfIn PDF document text
    • http://galojuxutiwas.epizy.com/wewijaratatow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 5456 bytes
SHA-256: 4da9ca881e05d758b6118a083b2bb9f3999649ed06f51e97cecc6cccd448824c
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 11092 bytes
SHA-256: 993f32324df88b02d9977d4a3fcadd35739d75009a5cd299c317726a60248f3f
font_02_sfnt_off0001186e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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