Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d81f8429f1dcc01…

MALICIOUS

PDF

101.0 KB Created: 2021-03-10 15:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 192e3db38ea7a19d65b27c3be0f5396e SHA-1: a035238321d4236b6aa8a95bd1c0b203bed384af SHA-256: 3d81f8429f1dcc01b41cf83e9cbad6ceee5293c7e0cd82b3cb960eafc566dfd3
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 is flagged by heuristics as a link farm and by ML as malicious. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=vintage+bose+901+series+2+speakers PDF link annotation
    • http://shlifovka-pol.website/96178920304jech.pdfIn PDF document text
    • http://esmoney.site/how_to_restore_yuntab_tabletwbzak.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/sopurikixulepidekagef.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/cljfxii/rorakigipibelomewolo.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/great_writing_4_great_essays_great_writing_new_edition_4th_edition.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/mujoritudaf.pdfIn PDF document text
    • http://myimperfectmomlife.com/matlab_plot_marker_color_rgbscuq5.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/a0VM8ib/current_team_go_rocket_lineups.pdfIn PDF document text
    • http://respect-ltd.su/mini_borescope_for_androidjzw3i.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/kiwanisaje.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/ggKyhc6/prison_break_season_5_episode_1_recap.pdfIn PDF document text
    • http://muldwych.com/microsoft_excel_logical_functions_tutorialqkckn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dazawojob/86836310093.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/28698633642.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_553550b6cef4408ea5a4c2f3edbc050b.pdf?index=trueIn PDF document text
    • http://gafodix.myartsonline.com/niebla_miguel_de_unamuno_capitulo_31_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/bekotafejuxomav.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_0e1d2c5ad80f4e11afae8f1768809ab1.pdf?index=trueIn 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_off00014162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14162 5392 bytes
SHA-256: 0d1ca2ebd3958a6884220d1986bb812e8db06bae40e904012264a92cb8bdb807
font_01_sfnt_off000153bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BD 10296 bytes
SHA-256: 4f9561835cd4d76f7d3b1c1b3683762591c6e231efb151691f4a298922b06c87
font_02_sfnt_off000176eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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