Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f1c6529447e813…

MALICIOUS

PDF

69.7 KB Created: 2021-03-30 12:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e066e9a2bb937070e5f42c1fd10d2c46 SHA-1: d804317ae762d731d8c4d35bb0c8e118d67043b9 SHA-256: 23f1c6529447e8135c14f9c098810eb5e3c3405c50bfca9d43da5f4997636aa2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/wix?keyword=saxophone+for+dummies+pdf+free PDF link annotation
    • http://febiterozoz.medianewsonline.com/icao_annex_14_volume_2_8th_edition.pdfIn PDF document text
    • http://dopogabijup.mywebcommunity.org/sesuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_604fbfc43dd56.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/chromatic_harmonica_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_60116e5eb063e.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/adverb_of_place_worksheet.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/applied_multivariate_analysis_book.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/3481027165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480893/normal_60388a0f0b65e.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/calendario_rusia_2020_imprimir.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/dadibabutudajerit.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/17845978543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452846/normal_603f2ae393e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_60586b1773db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_605ee1d54d145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383321/normal_5fffb175a6566.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/free_car_maintenance_manuals.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/how_to_find_income_summary_accounting.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/what_does_drum_rudiment_mean_in_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawiferow.myartsonline.com/veni_creator_spiritus_sheet_music.pdfIn PDF document text
    • http://bokepomi.onlinewebshop.net/12115455483.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/the_consultation_an_approach_to_learning_and_teaching.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 5420 bytes
SHA-256: cc3ea08a09c9adfcaba6d0e8b4bfb0cb87bd7e64b5beea62f4fc3fcadfe958dd
font_01_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 10964 bytes
SHA-256: c65271be6c81f63d294449924b35ea3398bb58d7ee3ea62e65775267b902e928

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