Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3047195b5c26bbc…

MALICIOUS

PDF

77.7 KB Created: 2021-04-11 15:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6caf0f060857f5d5e2de6e472c34daaa SHA-1: 03c4185325bf5600a1e8e029f6a60bcfb8ef78b2 SHA-256: f3047195b5c26bbc71aa5eb6a13270ab445a2a7a87aaa29594831d260bf17d38
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=matematica+financiera+formula+interes+compuesto PDF link annotation
    • http://kovuzaxaf.medianewsonline.com/vuxojitewubudamarizijuk.pdfIn PDF document text
    • http://nemagufi.mywebcommunity.org/9th_grade_math_word_problems_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/vomemubevu/GFiggc2/adairs_bath_sheets.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/case_files_family_medicine_google_drive.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/eThcifI/jofelibaparesixusuxev.pdfIn PDF document text
    • http://fly-drive.online/google_maps_share_my_location_iphone8g95i.pdfIn PDF document text
    • http://xazoxaruxilovo.iblogger.org/xubelerexonosuzevitaner.pdfIn PDF document text
    • http://wizudaneku.iblogger.org/wugip.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/xezedakinebavarafeguwuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/wixedineve/ahexkDU/xopomoxovokutowosekegufe.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/jgOgVjg/panonebojugalojolon.pdfIn PDF document text
    • https://cdn.sqhk.co/ribuwikoli/jh6cjit/dipevomi.pdfIn PDF document text
    • http://trokot-newshop.online/dfi_augered_cast-_in-_place_piles_manualsbg4h.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/jiYhj4t/drag_racing_cars_and_trucks_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/gvhbgiL/twisted_wonderland_azul_nsfw.pdfIn PDF document text
    • http://berimigigo.22web.org/mogebodisixibulol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovutemikinodow.rf.gd/algorithmic_notation_in_data_structure.pdfIn PDF document text
    • http://minirulo.epizy.com/bose_speaker_system_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2831a605-6f36-4da6-ac08-67771f0feecd/nenimekiwoveme.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/19273443559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f346bc8-d5bc-4d6a-b4aa-ec5d5d0e3e4f/genie_gict390_manual.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_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 5168 bytes
SHA-256: b6451a6495375da2358fc9ee582f4f202c3673f862ad1a61d3d21b5826bbfec7
font_01_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 12320 bytes
SHA-256: 2745e33bb8d0ea80d77309c4da2be3777d4df3bb2f680198c0e17d32a0f61852

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