Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fc9990e4b0c501…

MALICIOUS

PDF

81.3 KB Created: 2021-06-03 09:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ee278ef44a92480c1573363abe5a6f50 SHA-1: 04c06c9df2940d6fdb1f05bb874af45140c5cead SHA-256: 29fc9990e4b0c501181b86bec5b4c7bfb640c5a121c2f0383235c7b0bee3ae66
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users. The embedded URL points to a domain associated with phishing and malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=mckinsey+case+study+examples+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374540/normal_600d5b4fe7179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5fd6603205e82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_60061f690ffef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5ff0b73b47b08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457330/normal_5fee660cdd6f1.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/4ddfa402-2429-4ca3-aaf6-c5ae7352a202/why_do_pentecostals_think_they_are_better.pdfIn PDF document text
    • http://ritijix.pbworks.com/w/file/fetch/144511608/vikings_season_2_episode_7_fandom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7f6e51-7731-49ee-83a0-a21326f36f6b/why_is_my_jbl_charge_blinking_red.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144534060/steel_truss_design_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118e7595-cd6d-4f4c-89a9-c9a0b8d9bcf9/what_is_the_secret_behind_mona_lisa_painting.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144514356/dream_league_soccer_2019_kits_manchester_united_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0dcfe9-caa1-4c3a-8db1-e0a1b71a81c7/47812118431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86baaf9f-fcf1-435d-a6da-3ec872b503aa/lozemoxita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c7e904-1784-49d9-935b-ab33c9ca1bbc/exerccios_verbos_transitivos_e_intransitivos_7_ano_com_gabarito.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144532863/15193250762.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144425196/6022101002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19221797-37df-4f50-92ab-d2844a30da44/44526639631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd86391-f20b-497f-b41b-6252f5632c67/64443080328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db2e8dd-49d9-4611-8ee5-41a1e5f3854b/surijegamorufudije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b0a80c-ccc0-4769-ba55-618807bdd2ba/nexomeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac6c4da-ce9c-4673-af8a-eff591a6d240/nikon_d400_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6717517-b437-4745-97d3-652e51c1b12b/gulfstream_pool_heater.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_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 5444 bytes
SHA-256: 09bcfd13e3c06c4d76380198f8c1532c1add3aa0a9fd1bda75877d52f36001b2
font_01_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 10972 bytes
SHA-256: a566b67af0d4ae873330e0ea8644d2c34a740b0b83c153c0bf7f6dde6d4d409f