Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5f47396c108519…

MALICIOUS

PDF

75.5 KB Created: 2021-03-08 17:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 54ca91fff38afbc93b02c2bd88543aa6 SHA-1: fd87f7a4bad8ba47706adbb8fa825bb90d547453 SHA-256: 8f5f47396c10851959038db134f240a09319f812a1bce471d6d07770815004d0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous external URLs, with at least one identified as a potential phishing lure. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports the assessment of a malicious document designed to redirect users to 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://kuzutuzo.ru/award?keyword=problemas+psicologicos+en+ni%25C3%25B1os+pdf PDF link annotation
    • http://dotenipago.medianewsonline.com/popsicle_stick_house_plans.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/csOv7tV/sanivuvab.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/c6ggXjd/28859747715.pdfIn PDF document text
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/7978080.pdfIn PDF document text
    • http://nutapobo.iblogger.org/pabenifitifaseteka.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/how_to_set_stealth_game_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/qjjifgf/crossy_crash_mod_apk_unlimited_money.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/sarapano.pdfIn PDF document text
    • https://pexevirojaloko.weebly.com/uploads/1/3/4/8/134882405/bupakobamuxoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/18446157939.pdfIn PDF document text
    • http://pedamodaw.onlinewebshop.net/lord_i_need_you_chords_b_flat.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/40161737657.pdfIn PDF document text
    • http://jibimom.myartsonline.com/59159449689.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_ef883128eb944e208e5588afdbcec343.pdf?index=trueIn PDF document text
    • http://dofomexikokubeb.epizy.com/canon_rebel_t100_manual.pdfIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_004fac0a71a1419daa4ae6990feb0f6e.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_395e2459833f4347a1d466e0551faa4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/mosijozexeg.pdfIn PDF document text
    • http://dukejujegu.epizy.com/boferazob.pdfIn PDF document text
    • http://wakodojulugorez.epizy.com/brother_mfc_7860dw_change_toner.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/did_lord_of_the_rings_return_of_the_king_won_eleven_oscars.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_53442fe155ba469ca4bb005cea5d46d8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 5828 bytes
SHA-256: b21200888599d18497425e42e1a1167f972ca262b174b30c2e009372e77ac530
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 11872 bytes
SHA-256: 464624027f49a31d7249fe88ae825e3727e9ffd9638763af93ec31b564325cec

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