Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3bacc26ba1ca6c…

MALICIOUS

PDF

76.6 KB Created: 2021-03-11 07:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a4e25ce84a5e157ebc058aa433697c74 SHA-1: 26bd85ec53710ddd46a4173430c0f8bfce8df447 SHA-256: 6c3bacc26ba1ca6c56f085c003edd8fb0e211ae9fdc8932d81e6d3ba6a5efd94
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to redirect users to potentially malicious websites. The heuristic firings indicate a large number of external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute malware. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/award?keyword=oxford+history+of+south+africa+pdf PDF link annotation
    • https://jetesobamu.weebly.com/uploads/1/3/5/3/135323438/8828456.pdfIn PDF document text
    • http://shtangye.xyz/21709533050a4jr0.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/c0ef9b7bf7a3.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/gjeigji/i_viking_valhalla_creed_war_battle_vikings_games.pdfIn PDF document text
    • http://idclick.cash/1888903626asafk.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/soneribib.pdfIn PDF document text
    • http://tradebot.space/download_uphill_rush_water_park2law5.pdfIn PDF document text
    • https://xupunidumurewes.weebly.com/uploads/1/3/1/4/131437359/43224349db8917f.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/ja2zNnw/bowling_guide_rail.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/eibOnb7/baby_alive_doll_real_as_can_be.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/hLhdibB/fomoxotodorolokuziwoxosog.pdfIn PDF document text
    • https://litemavokof.weebly.com/uploads/1/3/1/8/131871991/pozidup.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/41031a2e-b325-45ed-8066-9cf33a73f783/how_to_reset_wd_my_passport_ultra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49853d8-c5b9-4eaa-9dfd-8f1c3f7e9bbd/go_tell_it_on_the_mountain_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bf6d97-d578-47d4-bbd0-afacdb61e420/fender_hot_rod_deluxe_180w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2904c0ec-0aca-4bbe-8f61-694c2fa89e50/how_old_is_kaz_in_six_of_crows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791900db-d9f6-4095-a772-a1184d718464/what_is_the_central_idea_of_macbeth_act_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bb8bee-74aa-4c1b-9a67-7381b97a8618/68037157585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70292ddf-830d-4d17-887b-827a3841e7f7/5199161841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246e6dd6-d88f-410d-a1c3-07d76d0c0f48/which_equation_represents_the_standard_enthalpy_change_of_formation_of_ethanol_c2h5oh.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_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 5408 bytes
SHA-256: 27637116b8cd49de57008f4f823c040c0d2b51ca83bfbcb798ab4a362dadd61b
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 10156 bytes
SHA-256: 4c898193ab2c084bd9be65f27b7cb830424a0c704d979563f0ab422264b8d05b