Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4dfa4cbf807f9f…

MALICIOUS

PDF

76.1 KB Created: 2021-03-21 00:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8cbf4704411a54fbe122e7881a8cdbc8 SHA-1: 82ac2eafb0228a2fab30ce0b33c03a8b2ff2b64a SHA-256: bf4dfa4cbf807f9fcc8665c5500728b84acba3723817628f7f28bfbdb0254d46
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically pointing to a lure related to 'kellogg 2020 casebook pdf', suggesting a phishing or social engineering attack. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=kellogg+2020+casebook+pdf PDF link annotation
    • http://leseweremizew.scienceontheweb.net/libro_significado_oculto_de_los_sueos_samael_aun_weor.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/92420949491.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/pufixozatopulat.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/90559024524.pdfIn PDF document text
    • http://nalodorepuwag.getenjoyment.net/mosup.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/finuvunabududakanagi.pdfIn PDF document text
    • https://wesarifalonaba.weebly.com/uploads/1/3/5/9/135961423/354ef77.pdfIn PDF document text
    • https://bigakajufejala.weebly.com/uploads/1/3/4/2/134265656/eeb94718fb15.pdfIn PDF document text
    • https://papozigej.weebly.com/uploads/1/3/1/8/131858530/kiviputudukeso_gurile.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/types_of_systematic_sampling.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/where_to_buy_lg_washer_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozaxanakix.epizy.com/biguxusaragigejiwural.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/talobabi.pdfIn PDF document text
    • http://kiguwodakoz.rf.gd/pdf_to_word_converter_offline_free_software_download.pdfIn PDF document text
    • http://ribezewipuzez.epizy.com/77232667061.pdfIn PDF document text
    • http://kegigija.atwebpages.com/83174763414.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/que_es_socialismo_y_comunismo.pdfIn PDF document text
    • http://degevojorak.myartsonline.com/65538485390.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/business_management_research_proposal_sample.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/1742634950.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/one_thousand_and_one_nights_sparknotes.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_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 5676 bytes
SHA-256: e8181a8e245c2abe2232981fec15e445b0232181c2e7ae44d102508af38137ad
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 10952 bytes
SHA-256: d185fdd7507d34731aa05e3ac9862856e25e8db7be70ce2e02c3c40f1583d677

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