Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf90973e78e027f…

MALICIOUS

PDF

89.7 KB Created: 2021-05-16 11:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e7a1a379411da220a589e0eaec2098f SHA-1: 70f78772394a90bc0d98326ff099c7033d825256 SHA-256: 6cf90973e78e027f962dcd1e43ba523ef1f449c5cf18604018d9b4d2843ec257
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with the primary suspicious URL being a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it may be used to redirect users to malicious websites or distribute further malware, potentially via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=historia+de+la+lengua+espa%25C3%25B1ola+resumen
    • https://cdn-cms.f-static.net/uploads/4469827/normal_6034370a2bdef.pdf
    • https://cdn-cms.f-static.net/uploads/4405195/normal_601a4bf2b7570.pdf
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5fe1283496ae2.pdf
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fc5a35c3ddea.pdf
    • https://static.s123-cdn-static.com/uploads/4368503/normal_5fcf21873d1f0.pdf
    • https://static.s123-cdn-static.com/uploads/4366995/normal_5ff81a73eb2b5.pdf
    • https://cdn-cms.f-static.net/uploads/4494451/normal_60469cc89df0b.pdf
    • http://dajobod.getenjoyment.net/short_biography_of_nelson_mandela.pdf
    • https://cdn-cms.f-static.net/uploads/4449012/normal_604f40b5772a7.pdf
    • http://kutegexuwudaro.getenjoyment.net/cisco_ccna_syllabus_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4366032/normal_600755e34ccd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bc80c028-b71a-4936-8b52-739d97125464.filesusr.com/ugd/fb4f66_f9d26a4eea254763ad4f2296f2e2042c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d849d096-f409-4d0e-8337-59d813ed4f81/juegos_de_pintar_online_hombre_araa.pdf
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_bb64464b3803488a8bbfb0f17412baa2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9479f3ef-290e-4ac3-8d97-b4f1b4225f7a/epson_stylus_nx230_not_printing_correctly.pdf
    • http://fuwutowamig.myartsonline.com/gujot.pdf
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_53e9bdf09dda46c88a871463e448a40a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/591d02c9-f54f-42ac-b385-806ecfbf4913/gartner_magic_quadrant_2020_cloud.pdf
    • https://uploads.strikinglycdn.com/files/a8bafa5b-eb4b-4f9f-b8bf-de693c6d475d/pojusitifososido.pdf
    • https://uploads.strikinglycdn.com/files/a60f3c84-554d-45c3-b39e-cf07dbc3627b/medofaz.pdf
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_c7c88b8a618545a6a4446ab9ee2d21b5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f9eecc74-3839-4573-a7d8-cedf52d76c00/what_are_the_four_types_of_infectious_agents.pdf
    • https://uploads.strikinglycdn.com/files/7a946726-bf01-4af0-a6b7-d8af638732dd/proform_505_cst_treadmill_buy.pdf
    • https://uploads.strikinglycdn.com/files/1833ee80-b4e9-4cb0-b628-d2797ad71a5f/2825248264.pdf
    • https://uploads.strikinglycdn.com/files/be6d1cb8-14ee-43ca-9bce-083c8c8f1e5c/xapupatufifuvuvulopo.pdf
    • http://furipurisebete.onlinewebshop.net/rufasinuvulurovazen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e89.bin
93a2b6114614b45656cbdbd7e6161eb59316191aad7dd44a74c8e48c997366fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 5452 bytes
font_01_sfnt_off000130b7.bin
0e998d0fab49f5b31f6443b80812d4d1c784a037c5a864a7b0778d9d54042127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 11816 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.