Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3e6b6b3bc0f707…

MALICIOUS

PDF

80.5 KB Created: 2021-03-05 13:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 92e39e3fcea7e0b5e3e7d860a91a7fec SHA-1: 479b4eb34cf2aa8badce1ccdf1e8425be27978f8 SHA-256: 8f3e6b6b3bc0f7075e568c50ce06f4c5950ecee738372effc9ddb81ae3036fdb
126 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 a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely to obscure malicious destinations. The primary malicious URL identified is https://ponafet.ru/strik, which is likely used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=3rd+book+in+percy+jackson+series PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374002/normal_5ff9428feed63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_60324efb9cc72.pdfIn PDF document text
    • http://mrt-pozvonochnika.moscow/lista_de_verbos_regulares_en_los_tres_tiempos_en_ingles_y_espaolielom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5ff1d8656b03d.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/lipenudanamanukudoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_602891ecbc051.pdfIn PDF document text
    • http://lumurezekosarew.66ghz.com/54646153872.pdfIn PDF document text
    • http://reassurez-moi-fr.info/70718027899jnbw8.pdfIn PDF document text
    • http://tanijijud.sportsontheweb.net/85532741980.pdfIn PDF document text
    • http://soldonlakewood.com/42052254492wjvp9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikukuvikato.myartsonline.com/pixibawuxufafa.pdfIn PDF document text
    • http://jomabav.epizy.com/get_the_guy_matthew.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/reformas_borbonicas_esquema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b7a0f8-39f4-471c-a6e1-f56b1c5c21e1/convert_inches_to_mm_in_excel.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/22500260305.pdfIn PDF document text
    • http://dejanubotikepiw.rf.gd/rikewagovitasunilo.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/longman_dictionary_for_mac_os_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5524c59-cfce-4dac-ade0-b1c44391e94c/pedagunexosogafojenagazus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce887a66-5bcd-4155-899e-6d8e52deea91/97993051124.pdfIn PDF document text
    • http://satekozamamusi.epizy.com/how_to_install_python_remote_start.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_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 5488 bytes
SHA-256: 4696a8952bd6b3d07e12826fc780b6dbdac1e647a917f7f34c4f0b6ff047226c
font_01_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 10920 bytes
SHA-256: 726477821e51c3ac1657b27d2233d883efadea6cb7a7d10ac4bbfe97b8e125fa

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