Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cfac9e4c3cf3a6…

MALICIOUS

PDF

130.3 KB Created: 2021-03-25 05:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fc71411847787ce4558c562923ecdccf SHA-1: c95225cda121c1450934b4c8b4a46d32e6c124ad SHA-256: 57cfac9e4c3cf3a6f64887847de9c3c5750c2d0af3d3774fcc67e08ce2e7adc1
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a potential lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a network designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/award?keyword=c+diff+guidelines+2020+pdf PDF link annotation
    • http://jijuduli.mywebcommunity.org/83072499438.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/char-broil_patio_bistro_electric_grill_with_tru-infrared_cooking_system.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/ighefeW/95112578467.pdfIn PDF document text
    • http://bagezokazuraw.medianewsonline.com/cavalleria_rusticana_verga.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/d1ZhCgV/oztent_foxwing_270_degree_awning_series_2.pdfIn PDF document text
    • http://vixitatevejiwo.getenjoyment.net/tefufenerip.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/2604394.pdfIn PDF document text
    • http://didazema.mypressonline.com/telling_yourself_the_truth_audiobook.pdfIn PDF document text
    • https://vafevovelawa.weebly.com/uploads/1/3/1/4/131407112/7850866.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/b2HgeJh/kerof.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/jufovovetefakabiruzuni.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/KWgfgiF/dark_theme_for_oneplus_7t.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/gisobejiwoxododof.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/stanley_fatmax_level_72.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://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_696dfb982168461980c9636a7493ebbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juduk/devukewano.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/modobogevunebifutamejo.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_6301404e52684f609ea6a5011394592f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godewumazek/zigawufuki.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/kennington_primary_school_ofsted_report.pdfIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_6c7d1d2458f84ebc8dc891916d0133e4.pdf?index=trueIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/caracteristicas_das_angiospermas.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_fcbc594c9f124c0ca337992294e2ade9.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_off0001b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3AE 4892 bytes
SHA-256: 9db9c9c0b0d026442cf18ee102dd81728e96212172c22744a58789ee1bed41bd
font_01_sfnt_off0001c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C460 12572 bytes
SHA-256: a37b496ed396d66acb6ce122e97e10adfd24d47ecf7307ae985b3f27cb9e2431
font_02_sfnt_off0001ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED41 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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