Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8a1c79128aa99c…

MALICIOUS

PDF

80.7 KB Created: 2021-03-21 12:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 52c3d3fc6e0959967aabf6e87974811e SHA-1: 4aef1e3298f8432ee2475c956465d6b2ef84833a SHA-256: df8a1c79128aa99c10766a6731b8787d130699b33af4c90d6ec519f9668e71e4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://bologen.ru/strik?utm_term=decision+tree+analysis+in+risk+management+pdf PDF link annotation
    • http://xulenegutuwovi.iblogger.org/milotesuvewuvaf.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/pofabofudarabu-sirizowav-lokas-mumumev.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/latukorulabojobaboz.pdfIn PDF document text
    • http://svoylend.xyz/starbound_pet_housepgorn.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/5467846.pdfIn PDF document text
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/6922a.pdfIn PDF document text
    • http://maska-respirator.shop/35954852464lyldt.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/f619960399f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuvasof.epizy.com/51527266933.pdfIn PDF document text
    • http://bujavajivedejin.rf.gd/2043432320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9448d863-1943-44d6-83d2-b136e12db529/99448742880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f717017-bd24-40e1-843f-6f7d3d001e0f/sinirumifukopajari.pdfIn PDF document text
    • http://tadoloko.epizy.com/39141706335.pdfIn PDF document text
    • http://mojideje.epizy.com/77697930207.pdfIn PDF document text
    • http://dowavatig.rf.gd/aagadu_video_songs_hdvd_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6e5270-5326-4675-8074-688097b2cadb/xofoworaxukajosefobuvofux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f324ae93-9e0b-4e51-8b28-601ba1bef848/vizio_sound_bar_vsb200-na_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd953ea-e60c-40ba-a260-0219953c474c/365_daily_affirmations_louise_hay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95bd2c7-1fc7-4b84-92b6-8668852d4a38/what_is_the_need_of_value_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904e4971-ca8c-4296-88ec-7edf02364e26/tosegavemizibebaxafux.pdfIn PDF document text
    • http://wowemipawugese.epizy.com/check_if_codesigned.pdfIn PDF document text
    • http://mebewoxesare.epizy.com/nuevo_lenguaje_musical_2_ediciones_si_bemol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e382f32-93c2-48a6-8c6f-78fb40e15efc/conair_extreme_steam_fabric_steamer_with_dual_heat_instructions.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_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 5640 bytes
SHA-256: 8329582ef3675a7cf03ee6cb14ed1605ac057521c54999a452e7d8dcd204c094
font_01_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 11536 bytes
SHA-256: c516162095aed6dd4d853389eca0c55d78adcc61672f17c06df345cd2afc2963