Malicious PDF — malware analysis report

Static analysis result for SHA-256 326e7a013a7c56ef…

MALICIOUS

PDF

81.8 KB Created: 2021-03-24 04:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 57a85edb30fcb78434a208cdec24ae52 SHA-1: b7bef3eec516a3b1bc9f2766ef00bf8d681f839f SHA-256: 326e7a013a7c56ef97daa9efe3e758050f18e94543a2095a40dc9c5214904915
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains multiple external URIs, with a primary one pointing to 'golowaki.ru', suggesting a redirection to a malicious site. The PDF's structure and embedded links indicate it's part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/123?utm_term=qualities+of+a+good+teacher+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454999/normal_605664267e4d3.pdfIn PDF document text
    • https://cdn.sqhk.co/fejumoraw/gg1iiha/diluvazepuk.pdfIn PDF document text
    • http://ighelperscenter.com/libro_quimica_organicakjwtn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_604716455e708.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/ajahn_brahm_books.pdfIn PDF document text
    • http://voirly.xyz/75794239354g3x2y.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/HMkh1gf/45920213696.pdfIn PDF document text
    • http://tonerinkstore.com/guest_post_outreach_email_templatew5e37.pdfIn PDF document text
    • http://moscowflowers.shop/dell_optiplex_780_sff_dimensionsywf5k.pdfIn PDF document text
    • http://digovin.getenjoyment.net/sejarah_agama_buddha.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/38274389588.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/drzheBV/79009396394.pdfIn PDF document text
    • http://gufutaca6.xyz/tikugujivqxy0k.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/a8tgfOp/halloween_evolution_trick_or_treat_zombie_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_602b01e5c4d78.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/what_the_purpose_of_a_mortgage_deed_look_like.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_60174e0d305c5.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/oblivion_game_of_the_year_guide.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/dinigugaxej/cookbook_cover_page_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/fifigawarisowuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/java_8_lambdas_richard_warburton.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/acer_chromebook_15_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/68746118005.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/clustered_column_chart_excel_template.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_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 5480 bytes
SHA-256: 17c8f1d6487898e01a286d65f6d700e8e21a0ab764ac737540a78d170ee6d113
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10836 bytes
SHA-256: 704e30dcc7006aff9ee8eb40518ca126e7b626c5c7a5871167b00ccf8e1a295c

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