Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab950ac272015f6…

MALICIOUS

PDF

77.8 KB Created: 2021-04-04 00:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d732106d314114d859500bf8fb80b03e SHA-1: 9d62fd62a29072aa1f0f7580f743b103e30a4a3f SHA-256: 1ab950ac272015f6809c262771899594c44fb02f4967e07885e8511109fb2883
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 and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+do+you+subscribe+to+someone+with+twitch+prime PDF link annotation
    • https://cdn.sqhk.co/kidatufo/icDgiig/16596488233.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/hi4kihc/99376400330.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/xZgiNgi/togodiwakavanukuvaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_602fd296dc174.pdfIn PDF document text
    • http://uplrezina.site/cuantos_vertices_tiene_una_piramide2y120.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/jje5Gij/hair_color_changing_apps_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369928/normal_5ff93d1754ff1.pdfIn PDF document text
    • https://cdn.sqhk.co/juxajomuz/hgjsIZJ/minerva_university_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/yXieph2/matchington_mansion_cheats_iphone_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/o4hfhhr/amazing_world_of_gumball_full_episodes_download.pdfIn PDF document text
    • http://m-laskin.ru/76161665215nvlxv.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/agcgdbb/56967141364.pdfIn PDF document text
    • http://azorocheat5.xyz/wolfteam_hileleri_indirmegfspl.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/3jeejb8/rogitazozekok.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/cL7BI40/bollywood_ringtone_2019_free_download.pdfIn PDF document text
    • http://buytoday.cc/alkaline_plant_based_diet2loo9.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/26e7c245-eb27-4efa-9f60-3f3aa6a7f5bf/pema_chodron_tonglen_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017f48d6-8379-45c4-bf74-f2b9222527cc/faulkner_barn_burning_theme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089b48c2-7f69-4889-ad9d-3ce4f48d32db/77997883102.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 5368 bytes
SHA-256: f9487ff8581742aa15e6ea692dc6dd1ed92902b5399ee342f0320c9f5b61d6bb
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 1796 bytes
SHA-256: d9f96797a54aa890ffc864a62d0ee1bea369dc139b9f5922dbee51669d5f236a
font_02_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 11344 bytes
SHA-256: 5896fa0c301c4b602feb0cfcb9ea002697855ff664800497af3b43e3650e0836

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