Malicious PDF — malware analysis report

Static analysis result for SHA-256 197cf76c5acaae47…

MALICIOUS

PDF

75.1 KB Created: 2021-05-14 11:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8380a8046c31e0222c928b6bf98894da SHA-1: 9e4e45618c1c51fb750bdbfd332ebab8bba98a99 SHA-256: 197cf76c5acaae4727f7e8923ddacb5907bcd7e3e83a4a60398ac20a60c3a268
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the presence of embedded URLs and the link farm structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+use+safety+1st+ear+thermometer+49551
    • https://static.s123-cdn-static.com/uploads/4491936/normal_5fff32d4817b0.pdf
    • http://miiliioner.xyz/sail_awolnation_piano_sheet_music_easyj3bhh.pdf
    • https://cdn-cms.f-static.net/uploads/4417406/normal_60212f7788c8e.pdf
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/vutiw_supeselabavug_xevelow.pdf
    • https://xatawozenovug.weebly.com/uploads/1/3/4/8/134886035/renimoremawu.pdf
    • http://crysety.xyz/zazejerakazz3vi.pdf
    • http://getcabinets.xyz/el_mundo_de_sofia_resumen_del_capitulo_16lylx.pdf
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/gewabiveveliso_wizevenonofike.pdf
    • https://cdn-cms.f-static.net/uploads/4409394/normal_605ac5b03ff23.pdf
    • https://fizakilugoleji.weebly.com/uploads/1/3/1/4/131438405/vifoladotadegax.pdf
    • http://hookup673.site/ejemplos_de_velocidad_instantnea_oxn67j.pdf
    • http://rudoxenupux.22web.org/encyclopdie_des_plantes_magiques.pdf
    • https://cdn-cms.f-static.net/uploads/4463794/normal_601ad420d8256.pdf
    • http://dogebidogapiduf.22web.org/the_biblical_counseling_movement_history_and_context.pdf
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/bupelevuk.pdf
    • https://fimegelepa.weebly.com/uploads/1/3/3/9/133999933/2efa79026.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zoniguzetixan.epizy.com/saskatchewan_coroner_reports.pdf
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_c29f2bc3d613462f84751223f3fae10f.pdf?index=true
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_fd1e651c0c6e42afa29c5355aacd5176.pdf?index=true
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_9e00e025fb704f3c9447c0967f8f8e4e.pdf?index=true
    • http://zuriromaruwo.epizy.com/employment_news_17_august_2020.pdf
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_8675a2cda7ab4ce18d27da8a09bce799.pdf?index=true
    • http://jamopuv.epizy.com/public_policy_and_program_administration_in_the_philippines.pdf
    • 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_off0000e2b3.bin
8d29f4f9924bcf065b923bb7dd46472ab3ae1f961a5bb06910d9f69a5f0a0e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 5552 bytes
font_01_sfnt_off0000f58d.bin
5b6e18c5ce5d546d3972b6e00fca27129e9ef2599a0290ccd66a1c80d20e9208		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 12280 bytes

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