Malicious PDF — malware analysis report

Static analysis result for SHA-256 673c5b648ed36546…

MALICIOUS

PDF

72.1 KB Created: 2021-03-14 21:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: faf157a9c06ae41b69f45836f9cf3588 SHA-1: f05de470580d2dd1bd305e50eaff137e17014712 SHA-256: 673c5b648ed36546696c89c1b8d288968f53bb3d1ffd020cee8dee9fb839ddcb
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, containing numerous embedded URLs. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs points towards an attempt to redirect the user to malicious sites, likely to download further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/award?keyword=little+phonics+1+pdf PDF link annotation
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/zijen.pdfIn PDF document text
    • http://centerverifybadge.com/912140987110lpfo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5ffbbf92b8745.pdfIn PDF document text
    • http://goodxday.xyz/516832835914udl8.pdfIn PDF document text
    • http://storergoods.site/dezatibijaboxewiwofensasjf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_6024c81a6ef22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_6041a8055f99a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_601b31d709748.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/jodogiwijema-zenitazibuw.pdfIn PDF document text
    • http://xipelosowux.22web.org/xixonovujuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5ffc085151c36.pdfIn PDF document text
    • http://matteset-spon.space/vezipumip6cei.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5ffe19e0d75e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465136/normal_5fc5804d59cd7.pdfIn PDF document text
    • http://koprovk.xyz/75903852491rxm1s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pogedezibak.rf.gd/nigarojaxuwaxafame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175431df-6f42-41d8-8c11-ad9939178448/cost_to_rebuild_mercruiser_350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef882a3a-fde2-465a-91ce-30f61a7a57cb/stihl_bg_86_list_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e135344b-c639-4ec7-a057-ac1dd40d2eea/yard_machine_550ex_140cc_oil_capacity.pdfIn PDF document text
    • http://jimogorop.rf.gd/gmat_verbal_review_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c309f0cc-e513-4fc6-b4de-13a5690ecd97/ganutaxatetesa.pdfIn PDF document text
    • http://bonizeza.epizy.com/folded_business_cards_template.pdfIn PDF document text
    • http://zenutetuzobo.epizy.com/how_to_program_a_universal_rca_remote_to_my_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a745fbba-4916-4bee-b62f-4c5ea3df8346/54922822161.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_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 4932 bytes
SHA-256: 124cb2e318bdaea217645e626b0971be66578c325aefc298e5f5ce5b65019701
font_01_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 19276 bytes
SHA-256: ad68cd29b552896d34387465cb23ac272f711ae4593ed6333225af1ad4d08720

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