Malicious PDF — malware analysis report

Static analysis result for SHA-256 438fcfbc69513727…

MALICIOUS

PDF

79.9 KB Created: 2021-04-24 22:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 36a426d890899d300cf79a2e79a0d9b6 SHA-1: 103126976b07021a2ec39aca996251e4c90114fe SHA-256: 438fcfbc69513727155919ce7f8310e3fed3322e7a7d5f082281039bbea37ace
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://ponafet.ru/strik?utm_term=harmony+dreamtime+deluxe+high+back+booster+car+seat+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5ff53c9210299.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471475/normal_5ff06fdbe0778.pdfIn PDF document text
    • http://mmmuuuue.space/31854652526ou7wa.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/hbF4a9U/top_10_everything_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_603044a450b06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_603aa92328603.pdfIn PDF document text
    • http://umkatrade.ru/pc_games_to_play_with_xbox_controllerdck0w.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/iaTdhxA/robotech_brace_for_impact_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/bjdghje/redutozaw.pdfIn PDF document text
    • http://bitsracing.net/kiluxx35gg.pdfIn PDF document text
    • http://managerprogram.live/23040776336v9k2x.pdfIn PDF document text
    • http://pribor-poverka.site/free_extreme_porn_videos5jiox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454425/normal_5fcb7a8c348d0.pdfIn PDF document text
    • http://bedetomime.22web.org/jibosak.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/dbb647b4-d988-47f6-b51a-be25339b66ee/24825405444.pdfIn PDF document text
    • http://zifekop.rf.gd/ansi_b16_5.pdfIn PDF document text
    • http://meridupomosim.epizy.com/corrugated_sheet_supplier_in_cebu.pdfIn PDF document text
    • http://pusevim.epizy.com/investigacion_cualitativa_psicologia.pdfIn PDF document text
    • http://tumaselopewebu.rf.gd/27700511541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c920f4c7-176d-4147-b7d4-12c56e702ccd/que_significa_orinarse_en_la_cama_un_adulto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7a6da6-8cbe-4fd5-a5dc-c7713fe2f080/clash_of_kings_mod_apk_download_for_android.pdfIn PDF document text
    • http://vumafovixono.rf.gd/kuk_b._tech_civil_8th_sem_syllabus.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_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 5840 bytes
SHA-256: d31c7cd25e7045783e2deafa2a211b50520b651f2bc0c6c8d6e911fe1c2ef66a
font_01_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 10912 bytes
SHA-256: f330da62236c3f211f82245bff88f9f43ee09c5eaa8b39069c14d5ab9bc4d0c2