Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6c9cf917bd6e7a…

MALICIOUS

PDF

77.8 KB Created: 2021-04-10 07:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c129456101b90a9a93716847eb8ec1a7 SHA-1: 72034f233aa5bba1c22b4601796cdab2a34365a0 SHA-256: 0d6c9cf917bd6e7a3cf9c2eb2ddf71114d93f99d62e5ee9670856e012abce64e
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 trojan threat. The PDF contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this assessment, indicating the document's primary purpose is to host a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=the+chronicles+of+narnia+prince+caspian+book PDF link annotation
    • http://fitotim.iblogger.org/asignatura_estatal_historia_de_tlaxcala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_6060fe8c60dfb.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/14284047910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fe5e8e0dc538.pdfIn PDF document text
    • http://talivijujod.22web.org/vadaxaji.pdfIn PDF document text
    • http://repizedozoful.sportsontheweb.net/rowusunodawapalumebuxage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_60011586d9c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_604d636860c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_604a94078e000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fd61f3d94816.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/ador_fontech_welding_electrodes_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_601e0236a6a5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebuvow.rf.gd/invoice_form_template_html.pdfIn PDF document text
    • http://gawusozuf.epizy.com/fumofapoxu.pdfIn PDF document text
    • http://morubinubifo.epizy.com/saxopibamodesasisekumip.pdfIn PDF document text
    • http://susesibukof.epizy.com/bulma_css_form.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/xovabasawopevisu.pdfIn PDF document text
    • http://wopaxigaromuf.epizy.com/4550149401.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_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 5256 bytes
SHA-256: 5b6bc95be56411f78a26cb1c0625f7016bbc3e85676920efb5883272634a16ad
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10704 bytes
SHA-256: 7a8b60b61ba9c9933f8c8c558be5572276bb3ce590dc5148fd5840a754f8b079

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