Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce23f40ddb6d1f10…

MALICIOUS

PDF

65.5 KB Created: 2021-03-06 20:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 004f391ff2aa14b46d334adb3aa6616e SHA-1: c49993a41829a40f816dcaa8f743d526eb6d1384 SHA-256: ce23f40ddb6d1f1096f5cb12ad98cbf02dcfdfaa9221830a05d73b54828f6876
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to search terms, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=brandy+melville+locations+in+florida PDF link annotation
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/18a4b575.pdfIn PDF document text
    • http://naturwows.space/585877714355iqi7.pdfIn PDF document text
    • http://trells.space/redejonufibawaral2lgk5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fcb63737e645.pdfIn PDF document text
    • https://jodulimije.weebly.com/uploads/1/3/4/7/134732884/bajirifokazuxalofil.pdfIn PDF document text
    • http://shoppingyxplus.xyz/dexipevujulopuruviavw4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489042/normal_5fd7722240e1a.pdfIn PDF document text
    • http://dnepr24.info/sample_data_sheets_for_iep_goalsmdfy5.pdfIn PDF document text
    • http://libertinemodels.com/16205616396rsr3y.pdfIn PDF document text
    • http://50offshop.pro/lutitinafopanerolokuzix54hvg.pdfIn PDF document text
    • http://tersq.space/bosewedojirubovikvn6pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lefadubofow.rf.gd/gopro_hero3_battery_charger.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_50ee73b5a972414fb6ce9a33bcbe6fc4.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_5b85332e41ba411ebf80f08e8c2d1d7f.pdf?index=trueIn PDF document text
    • http://pifetipopazemex.rf.gd/exponents_radicals_and_polynomials_worksheet.pdfIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_3083db2b36a547eb8759b3f3b25185d4.pdf?index=trueIn PDF document text
    • http://rifoxofome.rf.gd/riven_guide_9._23.pdfIn PDF document text
    • http://zipoxibel.epizy.com/atoms_worksheet_2_the_mole_answer_key.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_off0000c3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AB 5380 bytes
SHA-256: cad31f213d894013e7e93fb01c2ab0c24d55fff3cf6bf9c3cb9ce35e2210c843
font_01_sfnt_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 10160 bytes
SHA-256: 316cd2d08cf01bb31617f7338f6c5eed3882a73602d86254ec7929bb9b737792

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