Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9a8b520dbfa21f…

MALICIOUS

PDF

73.4 KB Created: 2021-03-10 03:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b1810942ee420ad1432b4020710c6912 SHA-1: 2800d0165adad25133d4e9bdcea8b99412133aa6 SHA-256: 4a9a8b520dbfa21fed56bbb45bc36fa827fe24a4cd9b64bafe18c857b1b5c44c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'vilenefex.ru'. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence. The document body, though heavily obfuscated, contains a question about the Voyager 2 probe, likely a lure to encourage clicks on the embedded malicious links.

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 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://vilenefex.ru/strik?utm_term=has+voyager+2+left+the+solar+system PDF link annotation
    • http://makeyourself.xyz/249867750605mq7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_60480f5d91e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_601afa28151e8.pdfIn PDF document text
    • http://thedouche.xyz/who_makes_one_touch_ultra_2_covered_by_medicarent59s.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/gusibote.pdfIn PDF document text
    • https://cdn.sqhk.co/xugavizira/GNgeUge/rugutaroserobalopuf.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/visio_basic_flowchart_shapes_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/jbjcYMI/double_masters_draft_booster_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/hhdjdic/the_farmhouse_nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fe68cfb7e970.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/i_do_all_things_through_god_who_strengthens_me.pdfIn PDF document text
    • http://bestcreditcheck.info/home_office_icd_1100lin5x.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/66146474278.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/iggRBib/aircraft_design_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6788045-21d3-4516-9a08-53d50a237d57/96396979392.pdfIn PDF document text
    • http://nekepozime.epizy.com/decision_support_system_report_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de70121-0ff7-42f1-89b8-699124a462f1/gorevudam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a180adbe-9258-4574-b0bd-dfdf551c8073/66292263788.pdfIn PDF document text
    • http://vawigopowapab.rf.gd/firehouse_subs_menu_lubbock.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_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 5436 bytes
SHA-256: 41a9c722c9c92cb29be9d6bedd86ab447c2811e9048e1b825bc12c90e40d8b06
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 10256 bytes
SHA-256: f71f457bb0ca96b8649a2aafe4cea547c2df3951260746f7c0252958fbf9a942

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