Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d6ad48f8f034fb…

MALICIOUS

PDF

68.3 KB Created: 2021-04-17 13:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3cf7dfc4ec4c1a7385dd5e4cbc78c1e9 SHA-1: fd20dd12c1b94bd08b388ee4e8dc1ca274c117b4 SHA-256: 04d6ad48f8f034fb5724ad81b84f4c72c84cb76d09fa528f7414f20582fac2d4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for SEO manipulation or to distribute malware. The embedded URL 'https://nipisod.ru/strik?utm_term=lego+star+wars+visual+dictionary+2020+pdf' further supports the attack pattern of luring users through deceptive search result-like content.

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://nipisod.ru/strik?utm_term=lego+star+wars+visual+dictionary+2020+pdf PDF link annotation
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/2393913.pdfIn PDF document text
    • https://zakazorexan.weebly.com/uploads/1/3/1/4/131407051/6905045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_6058db62684ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_604d4a41b00dd.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/e6fbaf1.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/9448183816.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/2cdbb4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5fca3cc25ff96.pdfIn PDF document text
    • https://vonojatu.weebly.com/uploads/1/3/4/7/134711894/3387955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_600549c965d6b.pdfIn PDF document text
    • http://zubudiru.sportsontheweb.net/estimation_and_costing_mcq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_600e54d06f92f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujuluj.epizy.com/18480192294.pdfIn PDF document text
    • http://nununad.myartsonline.com/saitek_x52_hotas_flight_control_system_joystick_pc.pdfIn PDF document text
    • http://rabelame.atwebpages.com/madutajat.pdfIn PDF document text
    • http://rakorasalonolit.rf.gd/meburutorumuxedif.pdfIn PDF document text
    • http://budivisatenebo.rf.gd/excel_based_project_management_dashboard_templates.pdfIn PDF document text
    • http://vowiguwoku.rf.gd/cours_anatomie_humaine_gratuit.pdfIn PDF document text
    • http://gazunobopa.epizy.com/62884415356.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/how_much_does_it_cost_to_replace_a_tankless_water_heater.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/alter_ego_francais_a2.pdfIn PDF document text
    • http://zilisidojaze.myartsonline.com/chinese_pinyin_to_english.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_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 5792 bytes
SHA-256: b6dd104d26a1d1cdd7ef817c0094dbed18b0bc2e1bd29694833f1802558aaf3a
font_01_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 10892 bytes
SHA-256: d0597344edf590e50ded61dc575e80fec0d633c5971cd3c6ca245951478ea8dd