Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21a527a7f27cbe3…

MALICIOUS

PDF

79.4 KB Created: 2021-03-22 01:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2e0ce81c7292a201e2b9a695a4f8ea5f SHA-1: df4e47cc19fd34dc09c683243b386fbc6af8e6b6 SHA-256: c21a527a7f27cbe3f13aba9d101a755ebd23262f981eb021d4d7dee319c7fb81
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('ponafet.ru') that is flagged as an external URI. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming on disposable hosting, suggesting a malicious intent to distribute or host malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=barreras+de+aprendizaje+pdf PDF link annotation
    • http://lavumosilewu.22web.org/como_crear_un_archivo_sin_word.pdfIn PDF document text
    • http://gafegenuwegapok.iblogger.org/rurarefewaxavuki.pdfIn PDF document text
    • https://kevifuzokidoku.weebly.com/uploads/1/3/5/3/135310888/3961147.pdfIn PDF document text
    • https://sonadenazutimiw.weebly.com/uploads/1/3/4/6/134654654/rowamilit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenadixajasole.rf.gd/xugejekedigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb57b06-b5a2-416a-a5db-27afa59b8ca1/2017_vw_passat_transmission_fluid_change.pdfIn PDF document text
    • http://ketanuviz.epizy.com/30817711696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90326df4-69c5-4fe6-a475-d5d62f5b8c67/casio_5081_battery_replacement.pdfIn PDF document text
    • http://xivutunitilema.epizy.com/vefujur.pdfIn PDF document text
    • http://luvojidepezepag.epizy.com/reading_pop_culture_2nd_edition_summary.pdfIn PDF document text
    • http://xamojivegubon.epizy.com/absolute_c_6th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/43880520565.pdfIn PDF document text
    • http://gisinazujawapub.epizy.com/19123858404.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/xeroxilozotefifivif.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/context_clues_worksheets_5th_grade_with_answers.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/ajogbajesu_twins_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84e7d77-fc22-4e2b-97a6-ef84eaa5bfa0/eriksons_stages_of_social_development_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b9f85c-1d36-4418-8447-aa48f12ff8a2/dasox.pdfIn PDF document text
    • http://wubazinosimisod.rf.gd/69115763722.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/journal_of_emergency_medicine_case_report_submission.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_8a0fa41997ce4605945a1cd7f99d0b12.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_1465cc0d09ed454188d2835086bee02f.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_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 5180 bytes
SHA-256: b81a6d42ff9ae6288649603cda0564ccb962512baf886bb3b7704ddeacd5425e
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 12536 bytes
SHA-256: 1aade4a1cfe48bc5049fd56cf7f537b418e69c8d5f850320100a81108fb640d7

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