Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fafc9a5eb09db46…

MALICIOUS

PDF

79.5 KB Created: 2021-05-26 16:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e4e8721e68454ffebda1b279ecc5d297 SHA-1: d9f227d0df411ac684f2b7488a0910b66851c1de SHA-256: 9fafc9a5eb09db46422039c84fbeac5adb9958e005f87572bb70e65ea621a17d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=french+reading+comprehension+passages PDF link annotation
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/2579305.pdfIn PDF document text
    • https://rigopodi.weebly.com/uploads/1/3/4/3/134307943/4133867.pdfIn PDF document text
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/8846486.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/zerupogosolem-rulorevome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485165/normal_6064cd5740696.pdfIn PDF document text
    • https://dazifonawifebi.weebly.com/uploads/1/3/4/7/134763946/seviwawazora-lavuxaxem-topabikeda-daxoremerisegaf.pdfIn PDF document text
    • https://fukokegoxa.weebly.com/uploads/1/3/4/4/134463136/kunidawaxofek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485818/normal_5fcd0cd35f74c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5ff19320a738c.pdfIn PDF document text
    • https://bufivenejolerad.weebly.com/uploads/1/3/4/7/134709937/dexitegarijumokek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90131f9-586f-42e2-9486-98d5a5384321/xokodupudupafagemagagoked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eaa1288-78bf-4753-abea-90455fdd1300/nemexugakipazator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4de9a82-6504-4604-8901-f2e971f653cf/why_is_my_gas_dryer_not_heating_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c292780a-5131-4ad9-a09e-cb0b867ef71e/what_is_the_structure_of_the_text_the_immortal_ones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea705b8-4e1d-46ee-8fa6-de9c7f6ecaf1/diesel_electronic_fuel_injection_system_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64bfd6d-bbb1-4afd-8191-1d9d30b17e9b/zameladakufiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc52790-e8ca-4f8d-aa89-041e2c6aad59/beder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24508bbc-171c-45d0-9285-a2b5c8f7aaa5/whirlpool_thin_twin_drain_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6c7c2e-4cb9-46cb-9048-07d826f55e06/88456795758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be06baa0-09e6-42ec-b889-4b1d371f6f86/74270084410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc482284-45da-4bb9-aaf1-5053185724b5/buzowop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9bf6735-5e48-49d6-93d2-7988d8a33faa/manualidades_faciles_para_nios_con_palitos_de_helado.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_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 5408 bytes
SHA-256: 4913a125c37e2a481a8c55241572e53d849030980657a4bb7b164c6bba92030e
font_01_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 12584 bytes
SHA-256: 40d64aa21cb1987a79c4f510ddd294f9a5fe23c1ddf5938a88820d1a961237bd