Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b9f6cb062bbcdc…

MALICIOUS

PDF

79.5 KB Created: 2021-03-29 15:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4ed98cd45123dc13e7d74fb659005ba7 SHA-1: 26f1943f8f0518c5f0650f2964d3bd04340d1542 SHA-256: e1b9f6cb062bbcdcf54c3b917614a4fdd781058f6a39e3a16fa6ce58761fd0bc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm or redirection scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=how+to+save+workbook+in+tableau+public PDF link annotation
    • http://xomuxurek.22web.org/84212166594.pdfIn PDF document text
    • https://bodijoso.weebly.com/uploads/1/3/1/3/131380183/gamexuguw.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/business_budget_planning.pdfIn PDF document text
    • http://mastera-saydinga.ru/36586310502n4x0d.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/cambridge_english_empower_a2_free.pdfIn PDF document text
    • http://itdomen.fun/24573844714yyxws.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/15095447159.pdfIn PDF document text
    • https://ridejotewofo.weebly.com/uploads/1/3/5/3/135314456/7329263.pdfIn PDF document text
    • http://usacarins.com/how_to_program_directv_remote_to_genie_boxm4w3d.pdfIn PDF document text
    • http://sacredname.ru/42077579169rw8x7.pdfIn PDF document text
    • http://inertbhjbj.ru/carta_poder_formato_para_llenaroj3dh.pdfIn PDF document text
    • http://stixlife.info/492259948114rkwb.pdfIn PDF document text
    • http://cashtanks.fun/251459499141noi4.pdfIn PDF document text
    • http://liolika-rsya.ru/12714025590b9keu.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/22700327763.pdfIn PDF document text
    • http://powerhdniy.space/ridasiju4dk01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talifox.rf.gd/apkpure_car_games.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/ground_to_air_signals.pdfIn PDF document text
    • http://xirozaza.onlinewebshop.net/oraculo_manual_baltasar_gracian.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/39578833605.pdfIn PDF document text
    • http://vajexakatozezal.epizy.com/98901456113.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_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 5244 bytes
SHA-256: 79d91284c06d18f4db10518f06b661d4a64d1c35ba6ed4c072f3239e595bab6d
font_01_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 11292 bytes
SHA-256: d3f8e3dc4be2966717654b61c5c978698ab44d4cc512365c296e3009f6377670

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