Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5658913c007ac0…

MALICIOUS

PDF

88.9 KB Created: 2021-03-14 15:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e49f42dd217f4388f531ea087d7b5352 SHA-1: 75440355f5ef6735edfde7974b77f955bc3d67b2 SHA-256: 3c5658913c007ac0653c9f0671376128738ddea5579573c1bccd3e5f3665f1d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to host malicious content or redirect users. The presence of embedded URLs suggests an attempt to direct the user to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/123?utm_term=accrington+academy+sixth+form+number PDF link annotation
    • http://itsamorem.com/88367092883ei85x.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/sat_essay_and_subject_tests_cancelled.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/lebugen.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/pefoworewekavitr1jdd.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/f9a2J44/lenovo_smart_clock_instructions.pdfIn PDF document text
    • http://hempmap.ru/bluetooth_adapter_for_laptop_windows_10xynez.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/wedding_anniversary_wishes_for_my_pastor.pdfIn PDF document text
    • http://vir-tus.com/rlc_circuit_lab_report_answerswucc8.pdfIn PDF document text
    • http://didazema.mypressonline.com/does_costco_have_car_seats_in_store.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/icLQBhc/feripakojumelilivifu.pdfIn PDF document text
    • http://mybiol.site/breville_slow_juicer_amazongw5hx.pdfIn PDF document text
    • http://makeyourself.xyz/tewuriym6nl.pdfIn PDF document text
    • http://avbox.org/minecraft_pocket_edition_0.12_apk_download4vi5k.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/Ggciaja/zurijimesurajoxafa.pdfIn PDF document text
    • http://lynciguest.com/network_diagram_project_management_examplect245.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/karijug.pdfIn PDF document text
    • http://nigasheff.xyz/plan_de_meuble_en_bois_gratuit7inqc.pdfIn PDF document text
    • http://usacreditmonitoring.info/how_do_i_reset_my_moultrie_game_camera86j3q.pdfIn PDF document text
    • http://alex-chekalev.com/kikimajajomedhm48q.pdfIn PDF document text
    • http://sreview.online/36202355012x79wu.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/80998549670.pdfIn PDF document text
    • http://enots.space/alien_blade_runner_crossoverm3s7u.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/ddSBsw0/ipad_pro_10._5_mic_stand_holder.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/qLZCZhh/yalla_free_voice_chat_rooms_tr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bototiluwoge.atwebpages.com/lenovo_thinkpad_t420_video_card.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/matlab_plot_points_without_line.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012bc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BC7 23496 bytes
SHA-256: 0dd5e740ce9e216540b379e536e63ff9727b437f90f8c053eb5ac62f037f80a3
font_00_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 5704 bytes
SHA-256: 9c86f1d0837378b46d352c305cc79302ca1b9c31eccc24097b2210d1fbbf390c
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 11216 bytes
SHA-256: 2d0d738ab916637d3a8cb8cbee93d0afc890e68abe5359bcca9428d78677352c