Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e1a0da504b9464…

MALICIOUS

PDF

69.7 KB Created: 2021-02-09 05:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b36b48ae18e318f23c46281a85b3dc88 SHA-1: 5720b935b6f793156398ac1cceef724cf59fc820 SHA-256: 42e1a0da504b94649a9a3e5ecb372357e9935bab1973f2f3df361087af519f57
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links, with the primary malicious link being https://jacksth.ru/123?utm_term=lifeline+gpl-4ct+canada. The ML classifier also flagged the PDF as malicious with a high probability. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to potentially harmful websites, possibly for SEO manipulation or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/123?utm_term=lifeline+gpl-4ct+canada PDF link annotation
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/5e9a4564556fe4b.pdfIn PDF document text
    • https://mizavujubamu.weebly.com/uploads/1/3/0/7/130775062/b6eea.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/38d930181f36f1e.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/Eji3ghR/11510820933.pdfIn PDF document text
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/gamusamovup_mesitese_sazaf.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/gijeja-perevabe-lujuvesoludowux-sowidorajitewo.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/pusijujikukirefolub.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/mitetupakemi-datutaxug.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/nisiwanolom/android_studio_how_to_install_build_tools.pdfIn PDF document text
    • http://laniferes.epizy.com/54184665147.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/bikaner_weather_report_and_wind_speed.pdfIn PDF document text
    • http://labapok.rf.gd/fipexefadir.pdfIn PDF document text
    • http://kibululugavi.epizy.com/equipment_handover_document_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/gagasuwifirilijatutasuv.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/hotels_in_nyc_with_bed_bugs_reported.pdfIn PDF document text
    • http://jonegukum.epizy.com/12849760951.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/melhor_aplicativo_de_musica_para_android_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/wielka_gramatyka_jzyka_angielskiego_edgard.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/bengali_calendar_free_for_pc.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_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 5108 bytes
SHA-256: 522986dd006485afde38b432ad606531a5e48f22aca3453fb333c7168285de7e
font_01_sfnt_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 10888 bytes
SHA-256: eab8aa34c29891c095bb4535d62d9e57bff44ae6f0ea1ff78411f63a3b87c496

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