Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c584a32376cd33…

MALICIOUS

PDF

80.2 KB Created: 2021-03-17 22:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c7fe33a774a003530ce47fa76bdaeda SHA-1: 562c2db0abca2e3e31b9f558d1e525ff028939ce SHA-256: b8c584a32376cd3370d3af12669d69677ca4a372c1877cc478ab4c95c47a0875
126 Risk Score

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 0.9997

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://gimoguvi.ru/strik?utm_term=compare+and+contrast+essay+structure+template PDF link annotation
    • http://kubosikavudux.mygamesonline.org/81482011786.pdfIn PDF document text
    • https://cdn.sqhk.co/nimawabej/gUEiics/zetomiwubosutese.pdfIn PDF document text
    • http://profaudit32.ru/is_cleverpdf_safef4ucy.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/ejjLkkc/nowamunafazel.pdfIn PDF document text
    • https://cdn.sqhk.co/bizufunido/jerBChd/xogenoxat.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/factors_of_production_and_their_incomes_worksheet_answers.pdfIn PDF document text
    • http://vigastlens.xyz/xosiduvezakobukijewuwazeiurlv.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/jjhgja7/happy_wheels_full_game.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/48215248168.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/TgjEjeJ/wings_near_me_columbus_ga.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/50863835627.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/wubasogo.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/gihgl5a/steel_ball_bearings_menards.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/xixida.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/G9gjjfU/mechanical_engineering_jobs_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/SJrgeTr/othello_movie_1965_cast.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/rogugagatuf/curso_de_ingles_nivel_avanzado.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/aachen_travel_guide.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/inteligencia_emocional_se_puede_ensear_en_las_escuelas.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/anticuerpos_antinucleares_interpretacion.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/wijipav.pdfIn PDF document text
    • http://korofituzuxigu.onlinewebshop.net/subway_roasted_chicken_salad_nutrition_facts.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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 5228 bytes
SHA-256: c3ba018541c8b58c64c78a6aba2673baf0faf73eb4a89548c5b8a9303073b40a
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 12076 bytes
SHA-256: 6065921cefb475e58543fa68e64a53098c4b643deee014be253d1389b4f58c22

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