Malicious PDF — malware analysis report

Static analysis result for SHA-256 5103db9ffb28c8d3…

MALICIOUS

PDF

81.5 KB Created: 2021-02-20 08:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2475dc3d6f77af59b8b319194589f756 SHA-1: 2be2d91f026fe990dfc0088f358c4449304acf6f SHA-256: 5103db9ffb28c8d3dff4301048b90c4926f419686268ea5c10ab8dfcfdcf5f24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to external websites, with several flagged as link farms on disposable hosting. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, potentially exploiting vulnerabilities or serving as a phishing lure.

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://jacksth.ru/wix?keyword=brave+frontier+ezra+trial+guide+pdf PDF link annotation
    • http://electriccannoz.club/76693622152ox4ph.pdfIn PDF document text
    • http://pristav.pro/nfpa_14_espaol5b87z.pdfIn PDF document text
    • http://m-laskin.ru/sowugimepatap9i2s6.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/vukukanewoj.pdfIn PDF document text
    • http://komarovskii.xyz/17155491747c9ylo.pdfIn PDF document text
    • http://klosheff.xyz/puxalizamefelomipapabokat1xn9b.pdfIn PDF document text
    • https://linanilutujaro.weebly.com/uploads/1/3/1/4/131453593/kelojudoravan_ketisefuzupow_xekitobepe.pdfIn PDF document text
    • http://zoomita.space/nopixewuwijud8e.pdfIn PDF document text
    • http://trixy-matrix.space/holmes_oil_heater_recall0k1ci.pdfIn PDF document text
    • http://shopmzm.site/ctet_sanskrit_question_paper_2019_pdgpke0.pdfIn PDF document text
    • http://losmopaka.site/nopovinusazerowaxakp1f29.pdfIn PDF document text
    • http://gobigs.space/bapuzvy7na.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/aee3503b25.pdfIn PDF document text
    • http://electrumwallet.buzz/persepolis_chapter_1_analysiscpuxs.pdfIn PDF document text
    • http://ibkreactiva2020.com/bollywood_award_shows_mp4u8pok.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/wexoteluwag/vevolikajotebiz.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/block_site_android_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/hubspot_inbound_marketing_certification_answers_2019.pdfIn PDF document text
    • http://pojudezafal.rf.gd/how_to_interpret_standard_deviation_results.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/honeywell_air_heater_manual.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_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 5188 bytes
SHA-256: 82dbb560c73e0a851e210ddc2d37b73455c3e30be21d8c2c5f92b59ccef1c0fd
font_01_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 14996 bytes
SHA-256: af8b2730503396a29cdedac80017397125153126b71c1575176bf4d0aaf2cd80

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