Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f25b2a6d993c257…

MALICIOUS

PDF

80.0 KB Created: 2021-04-16 20:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87cfedd456477e7f9e863b7c9ea62737 SHA-1: e111d863024fe1bc3a9408a6a37cbced1f6c2eb5 SHA-256: 6f25b2a6d993c257a1bca5eff34f6c9407bf3c9e1e0ae7204b4635a67eafc806
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=what+is+ati+in+nursing
    • http://woradegasuma.iblogger.org/vidmate_install_app.pdf
    • https://cdn.sqhk.co/nuvexajamu/hg9wRha/entry_level_project_management_jobs_nyc.pdf
    • http://xuroriwonufuz.scienceontheweb.net/17730020939.pdf
    • http://nonowun.mywebcommunity.org/fokuwewedazarisizabufeg.pdf
    • http://bulibujirifubof.scienceontheweb.net/vasisemirinelowonadamezu.pdf
    • http://xifotole.iblogger.org/osrs_fishing_guide_99.pdf
    • http://jugepawe.medianewsonline.com/lazunobenuwemukokirotadu.pdf
    • http://lamaded.mywebcommunity.org/57006158718.pdf
    • http://puzexijabin.mypressonline.com/williams_haematology.pdf
    • http://bogipeborowe.sportsontheweb.net/63035284517.pdf
    • https://cdn.sqhk.co/roratumopiv/yjhg2ih/download_video_instagram_iphone_2020.pdf
    • http://melomone.scienceontheweb.net/17369493751.pdf
    • http://vulufinagi.mypressonline.com/what_is_the_best_app_for_stock_market_news.pdf
    • http://matawobedopikam.mywebcommunity.org/mibowaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dexivovadoxexo.myartsonline.com/vupamoku.pdf
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_7596dcb57cde495aad9f1c7ef651fc0c.pdf?index=true
    • http://kusuganuxe.epizy.com/basic_electrical_components_and_their_functions.pdf
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_ed75a44227374542a358c4997e70b327.pdf?index=true
    • http://tuzikido.epizy.com/appareil_digestif.pdf
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_bc1e6e5992a34731a11a0c4fac8b1d31.pdf?index=true
    • http://dajodenojekox.epizy.com/diccionario_americanismos.pdf
    • http://jalebuvubo.myartsonline.com/joxameziwelebatepidibofi.pdf
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_79e71ea161ff4bfb97317295183d9f84.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8a.bin
b0ab3b81de18dcc7dd7523262a77e38f8780ef04e4dda180b5d8b4b1f125bfc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 4928 bytes
font_01_sfnt_off00010d54.bin
71ff8b6a23d850ba39e55dc587cd7d71214bfc88c8738d7dd54059adaf20a45d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 11020 bytes

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