Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67f24ba4f60290e…

MALICIOUS

PDF

79.6 KB Created: 2021-04-16 19:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8f67ba5624a83aa38cdaa7d43653800 SHA-1: d26700f77a44b3035018bf9ceff9217f43b5b03b SHA-256: c67f24ba4f60290e2ea7d1184a9971e6f0dd49cbb69727c2dc9ee65c2dda11c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'https://jumiwimov.ru/strik?utm_term=how+to+do+second+order+partial+derivatives', are likely part of this malicious infrastructure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+do+second+order+partial+derivatives
    • https://cdn.sqhk.co/monazaxumol/hgiMaWf/kathy_rainey_obituary.pdf
    • http://dodajavux.scienceontheweb.net/34486947218.pdf
    • https://cdn.sqhk.co/worupageke/hcshatz/68573728357.pdf
    • https://cdn.sqhk.co/moviferu/dhdTANW/44588839816.pdf
    • https://cdn.sqhk.co/dugelabomaw/iegfgia/assistant_director_ministry_of_defence_jobs_2019_syllabus.pdf
    • http://lakujalinifibo.mypressonline.com/architectural_drafting_and_design_seventh_edition.pdf
    • https://cdn.sqhk.co/gediwuwanol/L1BidIM/ultimate_robot_fighting_hack_game_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/183ca1dd-1dfc-4045-857a-42d0c7be716d/aasimar_what_book.pdf
    • http://zijedan.atwebpages.com/definition_of_political_culture.pdf
    • https://uploads.strikinglycdn.com/files/7b6b7b2d-03d9-42c2-80a0-8df7a94951ff/in_what_country_can_you_watch_twilight_on_netflix.pdf
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_c130998b449646fa871dfb4310043202.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5b723b4-5304-48e5-aa06-fa12c684a23b/problemas_de_porcentajes_6o_primaria_resueltos.pdf
    • https://uploads.strikinglycdn.com/files/057a26b1-c816-4571-891a-4079073fed38/38819753136.pdf
    • https://uploads.strikinglycdn.com/files/27306910-775a-41ea-87da-027fd3c5536c/62318141018.pdf
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_0ab8df4c59b94742bdcfbbee411dbd61.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/sijoseluxobefedukagov.pdf
    • https://uploads.strikinglycdn.com/files/53b3e4ed-ce74-470e-b937-8691bc1e96d2/samsung_bd-j5700_wifi_problem.pdf
    • https://uploads.strikinglycdn.com/files/d13ddd7b-18a6-4daf-a5b9-3e1bff3bf9d4/the_odyssey_book_16_discussion_questions.pdf
    • https://s3.amazonaws.com/bevekizadoxuj/85060647595.pdf
    • https://uploads.strikinglycdn.com/files/0a79f778-b76b-4238-a330-d3e22c9c1abe/sign_of_the_beaver_final_test.pdf
    • http://kisalonokexiwi.atwebpages.com/fevabuvosejivizezuni.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_off0000fb2d.bin
c7a4dbfa0001b27a2fef2d8a0452910add13ea7f5df4462b483f6ebfb23d05a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 5180 bytes
font_01_sfnt_off00010cef.bin
20891b07caff356446c7d57ce5315fbaa63c56421565e6016cc0d39333789f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 10480 bytes

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