Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4709cf6c75ae6a…

MALICIOUS

PDF

77.6 KB Created: 2021-05-30 18:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0b04352f4e72f212f75d73783cde6121 SHA-1: 8099d4360704fb4428a365b218cce1023b9997d9 SHA-256: 7d4709cf6c75ae6ad620a20209d83b87bf956c8c07ba493bfa71e22924a6a217
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One of the primary URLs, https://druttle.ru/strik?utm_term=la+gallina+degollada+genero+literario, is suspicious and likely part of a phishing or SEO manipulation scheme. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=la+gallina+degollada+genero+literario PDF link annotation
    • https://tidufafedufokaj.weebly.com/uploads/1/3/4/6/134693038/werido.pdfIn PDF document text
    • https://vepakuwaderim.weebly.com/uploads/1/3/4/6/134699920/8699677.pdfIn PDF document text
    • https://xizunobalik.weebly.com/uploads/1/3/0/7/130739811/f8c3be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_601e5cf55ffe7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5ff56c2605872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_605f926cc3808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_6058f7dd7d3b1.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/3746d44b-7f9c-4e1e-a887-732321ee12ab/xapixuxatoramemuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cfd123-65dd-4ceb-9091-a1eb445d6933/electrolux_central_vacuum_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db565fa7-677e-4c64-badf-e7bc03e64631/what_do_you_need_to_whittle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8148cb6b-500c-43d6-8875-aabb48f1c0aa/star_trek_enterprise_season_1_episode_17_dailymotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db41b8b-5408-4c86-81af-e9a28a134f05/xizotif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a65837-6cfa-42d5-9c32-40424ade671c/rocket_stove_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0290f80d-6a9b-40ad-928f-e4705b52983e/51051946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c917e5c-475e-416c-ac0f-e1a9d5e7d68c/tuwajemuvekuvagusor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5050556a-e4d2-46d2-aace-a2a25a4f899d/91859968776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3db8bb-3cca-4d02-ba08-ce0890e68bf0/31271149628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab69a15-06d3-48d2-9013-89e02d1b70d8/listado_de_verbos_en_espaol_e_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d970218-b01e-4ad5-b318-10ee7ed7d16d/how_to_download_ark_primal_fear.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_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 4756 bytes
SHA-256: 455c7b0b7040533baece8102684231ca5f58487958348d6dc6541a4c2e2cbd71
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 11680 bytes
SHA-256: 9573b13c76fe9ce135cf084bb85da3798981db0aab3159824967510c17075f5d

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