Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c96bd74b7651c17…

MALICIOUS

PDF

72.0 KB Created: 2021-05-26 13:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ac2f80671639462af951ababfbeb0e98 SHA-1: 21327c7e8993bc32c4aefc40b1f84b2bd3d0db12 SHA-256: 8c96bd74b7651c1745349080918379d1cd97e9c4f91435121fe92236705b9f77
156 Risk Score

Malware Insights

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

This 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, many of which are likely part of a link farm designed to manipulate search engine results or direct users to malicious content. One of the primary external URIs points to 'ponafet.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=what+foods+are+acidic+and+alkaline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367921/normal_6063144e07c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_602aaadc12d73.pdfIn PDF document text
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/9801935.pdfIn PDF document text
    • https://zelidewa.weebly.com/uploads/1/3/4/3/134371532/02bf3fe09682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496607/normal_6021c9013cb71.pdfIn PDF document text
    • https://rozigakix.weebly.com/uploads/1/3/2/3/132303329/73589.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/foxiwubumozupowimalu.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/8f3b1798-6a30-4cf7-ae22-0876988af092/fudogosumapopuvugeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d74ff1-8803-48f9-8252-1c145130ffa2/download_film_rudy_habibie_2_360p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afba7352-7db7-480f-8e3f-00de88f2c27e/vimufalemuxezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c65a7b-a525-467e-8d7d-b68ff914d39f/how_to_report_cyber_crime_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b44529d-e45d-466b-bc6f-46c505bacd9e/vulunedoguwoxugebomeniwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/521d999c-8350-4f58-801f-13ea47447cf1/what_if_tsh_is_more_than_normal_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f2a099-79f3-4975-a9e1-118e35319f9f/sotalesekekubepugogibubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381fee37-fa19-487c-a8b4-7ce282fad49e/aba_model_rules_1.13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de48dd91-5197-4d6b-8ac8-c53205cbb686/difference_between_the_fault_in_our_stars_book_and_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c991d8a0-4719-4178-8513-7dc11e59b5e2/brookstone_big_blue_live_not_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2700a9-d112-424c-9689-6528fa102134/how_do_you_edit_a_logo_on_a_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7246f479-3e66-43bf-a7c1-6ae6b187b37c/lefokewaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4cb2c4e-ab06-468b-8f08-368c1e067813/mokoxuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49afc082-2100-4f4d-a8b8-72f8560feaa7/software_project_management_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ceedb9-c006-4444-9791-5aa5553d5585/towowuxesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab5f709-343f-4f27-a327-d56025cc1cc3/resugojagunadegamejukig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460ccc29-acc7-4e2d-b53f-aa3ec9592612/merriam-websters_visual_dictionary_second_edition.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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 5184 bytes
SHA-256: 35edfbbd5432e6724825159344be6d9e19b315dcfffe9753e28483ff255c3fce
font_01_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 9840 bytes
SHA-256: afc200e021fcc0e62283e884db4006a22924a21e0e9a196b76f37fc0bbe73d48