Malicious PDF — malware analysis report

Static analysis result for SHA-256 439ce55db332e910…

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 23:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eef061e2782d462fdd3c30e2cc603fdd SHA-1: 70069dd49109417803d390ff6eee8bbf0d863947 SHA-256: 439ce55db332e910f2d1e46a84dcbd9596baa1cd6dd31552e30fea9956e1c3a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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://xezojetit.ru/123?utm_term=berliner+platz+1+neu+pdf PDF link annotation
    • https://cdn.sqhk.co/tajavujexiz/Mhdkjay/transformations_of_absolute_value_functions_calculator.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/what_are_the_roles_and_responsibilities_of_a_foster_carer.pdfIn PDF document text
    • http://megantv.site/mxq_pro_4k_android_tv_box_manualz1r3h.pdfIn PDF document text
    • https://cdn.sqhk.co/raxavetaletu/ghjiIgj/59815419089.pdfIn PDF document text
    • https://cdn.sqhk.co/kujexelorite/fiaXAji/vpn_public_or_private_network.pdfIn PDF document text
    • http://noxavikadovul.mypressonline.com/59665306012.pdfIn PDF document text
    • http://xewodatesuporob.mypressonline.com/93932923517.pdfIn PDF document text
    • http://wdd13.ru/idioms_in_the_bible_explainedh6dht.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/809481864091ac35.pdfIn PDF document text
    • http://vuvuga.xyz/loposaxemus97.pdfIn PDF document text
    • http://usesol.xyz/2754231337038he2.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/tupperware_550ml_rice_cooker_instructions.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/33586921530.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/gegdCgc/ninja_samurai_assassin_hero_5_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titarejidawe.epizy.com/22624810404.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/libro_aceites_esenciales_young_living.pdfIn PDF document text
    • http://lusitenaburasow.epizy.com/final_fantasy_xv_a_new_empire_event_schedule.pdfIn PDF document text
    • http://buvumurasamaku.rf.gd/brother_xr-65t_price.pdfIn PDF document text
    • http://zasidad.epizy.com/38688231601.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/spanish_essential_oils_desk_reference_6th_edition_free.pdfIn PDF document text
    • http://fedukiz.epizy.com/gmp_guidelines_for_new_product_development_ppt.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_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 5008 bytes
SHA-256: 12f8df8e131192fe2610bcb480f70401e0790586c25c174a050638c202402ecf
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 11748 bytes
SHA-256: f6aed1bef8e935997539e4abaad02008495eb60c2159037e13fa686d5f464fda

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