Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f173ceb04ef9cce…

MALICIOUS

PDF

77.1 KB Created: 2021-05-02 22:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 487e3754ab53ea78bde3f24af1e30eea SHA-1: 993773b6977a95a49f13cce5d6ce5e82358c07dc SHA-256: 9f173ceb04ef9cce2b7b3b520ed1ca4585f962ea5a379db446dd5d2acf4216a1
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' lure further supports this, suggesting the document aims to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=adobe+premiere+pro+cs6+tutorial+pdf+download
    • http://kogiwonewaveg.iblogger.org/politica_de_bienestar_social.pdf
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdf
    • http://xuxetosufuzo.getenjoyment.net/gimikibatet.pdf
    • http://powajaxib.medianewsonline.com/a_first_course_in_complex_analysis_with_applications_zill_solutions.pdf
    • http://rexuwoxaga.sportsontheweb.net/232324215.pdf
    • http://rupiwot.getenjoyment.net/jaxikumarabatudid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b7c7f19f-4295-49d0-8f7c-c5eebda5094c/77422355282.pdf
    • http://jilovin.epizy.com/financial_reporting_jobs_in_mumbai.pdf
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_9b97bec0a31444cba9809e2088df6a07.pdf?index=true
    • https://s3.amazonaws.com/zuses/battlefield_3_pc_free.pdf
    • https://s3.amazonaws.com/xalasawu/haynes_holley_carburetor_manual.pdf
    • http://likuxusodim.epizy.com/quimica_organica_alcanos_alquenos_y_alquinos.pdf
    • https://uploads.strikinglycdn.com/files/d2bc4ad9-dbb0-458f-a29b-c2a6d1ac7550/21721894615.pdf
    • http://gevogorusitaw.epizy.com/ad_hoc_reports_define.pdf
    • https://uploads.strikinglycdn.com/files/204d8bb7-e0f5-40f3-9ecd-a3b8e3f510fb/manual_de_instrucciones_hp_photosmart_c3180.pdf
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_d7883eac9b2f4809b5f707d8fc17836f.pdf?index=true
    • http://jasagedonemope.epizy.com/velopitetewajejopimejeda.pdf
    • http://putojoner.rf.gd/55819541086.pdf
    • https://uploads.strikinglycdn.com/files/e3963871-8fd4-4f24-b1ea-73a215438cb9/kaplan_mcat_prep_books_second_edition.pdf
    • http://dewelimu.epizy.com/acrobat_pro_trial.pdf
    • https://uploads.strikinglycdn.com/files/bff0c169-8302-4919-b988-f9ce4dde7307/lituvasixeva.pdf
    • https://s3.amazonaws.com/jusuberu/brandy_melville_gift_card_target.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/nekowepufelerex.pdf
    • http://lufusemeg.epizy.com/krups_novo_964_dichtung.pdf
    • http://susejukeb.epizy.com/malinowski_argonautas_do_pacfico_ocidental.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdd.bin
55df2d9be7bc8135cbd9de63197c951154e1103089db054e01463de1857c0ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 5676 bytes
font_01_sfnt_off0000ff22.bin
33df5556862a06c52866a561d8c9a3af22be7b9c61992cfc62e2deb8c30d6831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 12280 bytes

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