Malicious PDF — malware analysis report

Static analysis result for SHA-256 557d94d6a8ce953f…

MALICIOUS

PDF

77.8 KB Created: 2021-04-14 07:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dd03d414da0e5e46fb297d540f25c077 SHA-1: 32d670110f8fe6843222290da8b85e0174f214ac SHA-256: 557d94d6a8ce953f06afb6318409be725eb0bed6e79d0f830511d56bfc592a46
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within it. The heuristic 'PDF_SEO_LINK_FARM' indicates a high density of links, suggesting an attempt to manipulate search engine results or distribute traffic to various malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the sheer volume of external links points to a coordinated effort to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=artemis+fowl+book+2+summary PDF link annotation
    • http://nalatakojuzali.iblogger.org/jilosuxikosolizuvekajuv.pdfIn PDF document text
    • http://guronid.mygamesonline.org/19568302011.pdfIn PDF document text
    • http://nubebukexowi.66ghz.com/1-99_crafting_guide_osrs_profit.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/how_to_fix_pegasus_bathroom_faucet.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/TmiehdQ/titan_quest_switch_update.pdfIn PDF document text
    • https://resumasilazivo.weebly.com/uploads/1/3/4/5/134509929/musagamiso-gepitumatijosa-safuma.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/hijihfZ/netacad_answers_chapter_3.pdfIn PDF document text
    • https://kojulijorivo.weebly.com/uploads/1/3/4/3/134329781/rikoxeg-numodaxoz.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/gha8CZw/find_my_android_phone_app_for_pc.pdfIn PDF document text
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/xutuxurutir_rubiwinuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/ibhiiXj/55887920887.pdfIn PDF document text
    • https://fusorebumobem.weebly.com/uploads/1/3/3/9/133986296/pixomu-xejimixoxotitot.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/piriw_pamegefomegel_gajujozuwitow.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/0FieGTo/galaxy_attack_alien_shooter_para_pc_gratis.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/bawirawurudafezi.pdfIn PDF document text
    • https://kawotubizon.weebly.com/uploads/1/3/1/8/131871780/4280138.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/capital_budgeting_process_steps.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/gfrkDza/79745208952.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/gdxogdL/kurdish_to_english_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kedetofido/Hijifje/calcium_carbonate_powder_data_sheet.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/wetumexuvab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaluketiwif.epizy.com/renina_angiotensina_aldosterona_fisiologia.pdfIn PDF document text
    • http://zepuwiz.atwebpages.com/revovululaxixa.pdfIn PDF document text
    • http://rugilunu.epizy.com/acuerdos_de_oslo_1993.pdfIn PDF document text
    • http://jifobobaganut.epizy.com/1138926263.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_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 5432 bytes
SHA-256: ece55b828125c9e1a4a387c295620bf9970898fedbc508c35aa2dd4c6e314141
font_01_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 10188 bytes
SHA-256: 7446917a4e741f244bee37cb32224e96414d4693d5028289cf3e21977129b732