Malicious PDF — malware analysis report

Static analysis result for SHA-256 2555d1d55e5ba935…

MALICIOUS

PDF

66.0 KB Created: 2021-02-17 06:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: da96f4f6376ff070b2f9c00f56a6bb74 SHA-1: bfdc975bca9c9c3cee537bd19ec80278523d6e66 SHA-256: 2555d1d55e5ba935a8ec44d824c0c220947f8eba2bc085af4c4828ec8bfe59d9
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wix?keyword=wish+it+was+true+lyrics PDF link annotation
    • http://xisulekotitis.iblogger.org/nabetubitutegenoraju.pdfIn PDF document text
    • http://blaugrana.ru/62783520291xcel5.pdfIn PDF document text
    • http://ruwulabosubev.iblogger.org/waxatuxemokolebezilodolug.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/8f8bedc517.pdfIn PDF document text
    • http://raffle.website/37142799018rrd3g.pdfIn PDF document text
    • http://itawegan.space/grid_systems_in_graphic_design_by_jokw50v.pdfIn PDF document text
    • http://zewikeb.iblogger.org/41261064911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemewef.rf.gd/34982570637.pdfIn PDF document text
    • http://wazododasexixak.rf.gd/car_accident_police_report_austin.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/checkpoint_endpoint_security_management_server.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/excel_spreadsheet_not_printing_gridlines.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/ohio_putative_father_registry_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/vb._net_date_format_24_hour.pdfIn PDF document text
    • http://vuvabideriwewet.epizy.com/28965153851.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/larub.pdfIn PDF document text
    • http://mujedofagogi.epizy.com/tejupij.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/would_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/la_la_land_theme_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/fefelimamakobe.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_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 5096 bytes
SHA-256: 1c50956bc608905b2aa66cc31909754dd4147f9f01c4ece25476bd7df3739358
font_01_sfnt_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 9692 bytes
SHA-256: 35c3e0c34fd35e816fa12b193bc47a4244a5e466098f2a20c7a1e19bf2f72864

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