Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8b3b6625bd2dbc…

MALICIOUS

PDF

91.4 KB Created: 2021-03-24 19:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3d645b548f2c909eec6f021c97bd3346 SHA-1: c4d5b80c4388cff1cbbdd9d498eb0e39dbee901a SHA-256: ba8b3b6625bd2dbc647a86b91b164b9f80817c4ea6d43ce7814996509df32020
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain 'jacksth.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external URIs and the link farm nature strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/strik?utm_term=descripcion+de+personajes+la+ciudad+de+las+bestias PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459477/normal_60013f378113d.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/gsVgjgc/wojetipipewuranonij.pdfIn PDF document text
    • https://sibewelile.weebly.com/uploads/1/3/0/8/130815008/funix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_601a198a45864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5fcc3b7f56e3d.pdfIn PDF document text
    • https://guzarederojem.weebly.com/uploads/1/3/4/3/134392385/5490337.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/diehchc/british_home_renovation_shows_on_netflix.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/eae7c2bb519601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375095/normal_5feb7193e7ec1.pdfIn PDF document text
    • https://temabodanifow.weebly.com/uploads/1/3/1/4/131454916/7799149.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/RhgEjda/zumazemo.pdfIn PDF document text
    • http://dovulup.iblogger.org/lubemin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_6030941b38757.pdfIn PDF document text
    • https://cdn.sqhk.co/tijanukubo/giicFhj/zanugapefukosupesota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_60328046eb856.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/8iinFij/ferire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420599/normal_5ff164b71a8b8.pdfIn PDF document text
    • https://wironutoti.weebly.com/uploads/1/3/0/7/130739747/pikodajod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b01343a4-086a-4a19-af87-d706702f8868/rawewiwexow.pdfIn PDF document text
    • http://gizimup.epizy.com/bapupaba.pdfIn PDF document text
    • http://pamemoroza.epizy.com/how_to_deal_with_psychopath_neighbor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2250aabd-b499-45c6-a9ff-6f32ca7a8e5f/do_gravity_boots_make_you_taller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdb880f-4c4b-402f-a6d4-e57c4092dfbd/is_it_possible_to_build_muscle_after_40.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720577ab-f12e-426c-a2fd-1eb53ac6e23d/the_bone_collector_film_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9406f455-6bea-40e7-a605-2a063587ba0c/iso_9001_version_2008_standard_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 5164 bytes
SHA-256: f4784d2e65e1f769264d4ced4bc47fcafdc80c0c14fbd1c0e66ae6e52a438617
font_01_sfnt_off000129aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 11708 bytes
SHA-256: ac2a599f22af5e0cdade1e3f83a756e95fc12ba70441be589cba81b6f1fbf64f
font_02_sfnt_off00014fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f