Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b1c3d3e6a05c03…

MALICIOUS

PDF

72.7 KB Created: 2021-03-23 17:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c701f6da3b9c86faf7cff0b851d0d6b7 SHA-1: 939824fea2cb11be0a06185ee9e3d152dc0749a2 SHA-256: 90b1c3d3e6a05c03a4c4d4a8471b30451d81a1b14eae8ea706dc56ffdf82f937
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=what+are+the+different+types+of+structures+and+give+an+example PDF link annotation
    • https://cdn.sqhk.co/fujalapevame/dichege/vehicle_checklist_form_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/goxepijikun/gWjhjfn/draft_guide_double_masters.pdfIn PDF document text
    • http://grigolia-studio.ru/mavajowivemazolumemedqe8g.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/hb1hcie/goodreads_quotes_self_love.pdfIn PDF document text
    • http://idealicaitalia-official.site/from_critical_thinking_to_argument_6th_edition_onlineoopor.pdfIn PDF document text
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/3820098.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/gf5ggxk/lookbook_template_free.pdfIn PDF document text
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/4196281.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/thjgiij/monument_valley_hotels_pet_friendly.pdfIn PDF document text
    • http://copyrightprivacy.site/jawitexag3vn5i.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/vlHofgh/mods_installer_for_minecraft_pe_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/bjcNuia/toyota_conquest_1._6_car_for_sale.pdfIn PDF document text
    • http://optarfes.com/exigence_ap_lang_examplesejw36.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/moreover_furthermore_in_addition_exercises.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/gasexiliniwaz.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/2163873.pdfIn PDF document text
    • http://cocobeautybar.ca/viwajubezikuvuwukoguzilidnu.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/ljgjeGj/sebutijamo.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/e3FghmR/29128264086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujimosodaza.myartsonline.com/chacun_a_son_gout.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/37947143180.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/what_is_the_pedagogy_of_the_oppressed.pdfIn PDF document text
    • http://kapowuxivi.atwebpages.com/ryobi_2000_psi_electric_pressure_washer_problems.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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 5812 bytes
SHA-256: a661c6aa26d642fda142dd5252d464f675ee8cb269491041598c88b98862a475
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 10084 bytes
SHA-256: 0bc869d2e76e11101611f0cc76cf222b2f62d7e36b759e734f0e1133e9905144

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