Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbee35476dce7434…

MALICIOUS

PDF

76.0 KB Created: 2021-04-04 12:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dd6fb5fd2579035c677b5fc21fb4d852 SHA-1: baf012db9d1095f36bad6ae33f19a678b7f00291 SHA-256: dbee35476dce7434df7f12015ea744ce715ca110ba45072f8d1518858bdaa8db
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious link farm designed to redirect users. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains keywords related to product pricing, suggesting a lure. The presence of embedded URIs and the link farm heuristic point towards an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://xajibur.ru/strik?utm_term=sub+zero+36+side+by+side+refrigerator+price PDF link annotation
    • http://jonotijero.medianewsonline.com/hernia_de_hiato_tratamiento.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_6068cae43e4bc.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/mpsc_answer_key_13_may_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_6064581e6e57c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_5fe7a2000be57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_6018c2f1cc6b9.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/adverbs_of_manner_and_degree.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_604cfcf251ad5.pdfIn PDF document text
    • http://kataeta.club/gozunekoxivudowotivuvibe2fak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_603d12c769f13.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/99741827475.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/axial_scx10_3_rtr.pdfIn PDF document text
    • http://xplaintome.ru/8188452795ofy46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368735/normal_6004b7206be9d.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/79249141104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406793/normal_5ff4d397500c1.pdfIn PDF document text
    • http://hdsamara.ru/troy_bilt_generator_3550_usedec8wi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najukelosuned.myartsonline.com/barthes_camera_lucida.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/all_clad_4_qt_slow_cooker_manual.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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 6004 bytes
SHA-256: 990f50ecf31c6e1217b12b07927c4271a099ee680a04cc34d769c29e7eb4a3a9
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 10984 bytes
SHA-256: 4fcd26ee8501d512f192c56427be28397ec4d9d76ec5062d564b630c2a885228

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