Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a21870173083f9…

MALICIOUS

PDF

80.1 KB Created: 2021-03-18 16:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 05e4e5262ea714399a25c409a8243c1c SHA-1: 79bbd8a3cb8c0c30c6aff52ef0e54ed5d6b8b80e SHA-256: 30a21870173083f90d25053390ef8d11c0e53e61afbf3415e4d82dc1edf2a3df
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to 'kuzutuzo.ru', a domain flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=is+there+another+outlander+book+coming+out PDF link annotation
    • https://cdn.sqhk.co/xanodujijefu/djhhb4e/time_flow_vitality.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/gh3Rieo/xamiwuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_605030f6b1c8e.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/vmJKxji/honda_gx160_5._5_hp_engine_for_sale.pdfIn PDF document text
    • http://3bki.ru/what_is_the_description_of_interpersonal_communicationbwrdj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5fc9157ca99bc.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/the_count_of_monte_cristo_alexandre_dumas_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/phfpbja/41728106427.pdfIn PDF document text
    • http://lovepositions.info/how_to_descale_saeco_giro_plus0ea7q.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/ic2bop7/business_manager_job_description_small_business.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/0drcXjb/japudolofelexula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6023af408b859.pdfIn PDF document text
    • http://bigowet.xyz/does_baby_trend_sit_and_stand_fit_chicco_car_seatamngc.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/takobedor.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/ibhifLj/asmr_english_breakfast.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/dusagusopaturu.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/jaMRphj/play_based_literacy_activities_for_kindergarten.pdfIn PDF document text
    • http://axecheat1.xyz/180557248336hetq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/977fada6-9a48-4331-9d21-1b744bcfe47b/gopro_hero3_black_edition_wifi_password_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cd9676-baf2-4339-af6f-fe1ce93e04c8/reset_imaging_unit_samsung_xpress_m2675f.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f831cb4b-3554-4b10-b892-35d468b5552d/7950498527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8c23ec-ef05-4fb8-9fc0-7d364a9be01f/74324377851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2a2b00-f2ee-4bf1-a63a-5bf0dd431ee3/pofuluxenet.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/37541295093.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_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 5492 bytes
SHA-256: 35914419a21d4f1b0babfdc9495c9dc95e01fdccc531d91901c66e3ccbb7f1b0
font_01_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 11420 bytes
SHA-256: 6c052e0959452cd9b37c1b8f947a8203bbe5cd94c1f1ab1c8b6d600a12e20abf