Malicious PDF — malware analysis report

Static analysis result for SHA-256 229813ffb9c901e4…

MALICIOUS

PDF

120.1 KB Created: 2021-04-23 07:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4df4797a30a676c72a0c1defe0c777 SHA-1: 7e0f193f823da16e8b6d9d1bfb3608940cf6f387 SHA-256: 229813ffb9c901e4ef7e6645512fd6d18a1c9277c91396d8b5dfc698ce1de7b5
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL, https://jumiwimov.ru/strik, is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

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://jumiwimov.ru/strik?utm_term=good+morning+bhagavad+gita+quotes
    • https://cdn-cms.f-static.net/uploads/4368978/normal_603fedadbdfd2.pdf
    • http://tanuwoxomasosog.22web.org/blood_relation_questions_for_ibps_clerk_exam.pdf
    • http://rotiwopofeze.mywebcommunity.org/nivivabaz.pdf
    • https://cdn-cms.f-static.net/uploads/4463552/normal_603a76476f112.pdf
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5ff3b79e3a0f9.pdf
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5ff2bf6e8b342.pdf
    • https://cdn-cms.f-static.net/uploads/4476140/normal_601d8ca5a8bd8.pdf
    • https://cdn-cms.f-static.net/uploads/4369495/normal_602d8c618692a.pdf
    • https://static.s123-cdn-static.com/uploads/4451545/normal_5fe4da310d2fd.pdf
    • http://xonejalevesezom.sportsontheweb.net/elements_of_periodic_table.pdf
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5fdb1518c16a2.pdf
    • https://cdn-cms.f-static.net/uploads/4476453/normal_6060805631a8a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://nupakavidowux.epizy.com/heart_anatomy_physiology.pdf
    • https://uploads.strikinglycdn.com/files/4f913856-478f-4f48-8261-a615e4585991/tejowajusafisirukux.pdf
    • https://uploads.strikinglycdn.com/files/b6450be1-d082-4376-8538-6e1ed8d69d8e/wd_my_passport_ultra_2tb_review.pdf
    • http://ragudoduwe.epizy.com/consumer_buying_behaviour_towards_chocolates.pdf
    • https://uploads.strikinglycdn.com/files/cc0fcdc0-a148-4dd9-8fd2-4d3bf81c3215/busutaxowobidosoxumeweli.pdf
    • https://uploads.strikinglycdn.com/files/0865cd8d-0110-4fe4-90f9-eed4806cd338/stock_and_watson_econometrics_4th_edition.pdf
    • https://uploads.strikinglycdn.com/files/b5487401-09bf-4bc2-b291-9c32b7e42fac/how_to_program_honeywell_rth2310b_thermostat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001878e.bin
26bdc05a26e88fcb31a65fa6d4c2edb80cec63c71c85cb1d2347f8a3e1bd651f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1878E 5564 bytes
font_01_sfnt_off00019a48.bin
9a35d2d67f9ca09126598b984e4942f3b75d641bba62c0540de7bf3d334e2d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A48 11896 bytes
font_02_sfnt_off0001c14d.bin
59f2308283c9c13173d490c0e80febca0804c2c9af96da5163229f2bd665a0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C14D 4328 bytes

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