Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bafe409ccbeb9dc…

MALICIOUS

PDF

77.0 KB Created: 2021-03-31 15:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b764f03c7025141546ec898325fd4ffe SHA-1: 263a63959ceedc6a65add7b0c4ef3fb339c78996 SHA-256: 4bafe409ccbeb9dccb0f3b8bc1354103783ab88226be2224331fa3c3ea5d86c3
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of a 'utm_term' parameter in one of the URLs further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=how+to+change+afterglow+controller+color+xbox+one PDF link annotation
    • https://cdn.sqhk.co/zujumatatub/Azmgfgh/nuclear_arms_race_effects_on_cold_war.pdfIn PDF document text
    • http://bobalexes.iblogger.org/begafabadebepalijijafuko.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/nerapofisir.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/bhfjeVA/clash_of_clans_dragon_s_lair_3_star.pdfIn PDF document text
    • http://creamwalls.space/the_last_leaf_poem1u5y5.pdfIn PDF document text
    • http://zezunorutiv.iblogger.org/upkar_books_free.pdfIn PDF document text
    • https://cdn.sqhk.co/laxepinam/3hdi3ha/rtc_bus_schedule_5.pdfIn PDF document text
    • https://cdn.sqhk.co/biwopeka/hdjdhjN/dilineze.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/nedagurugutoxenumubumi.pdfIn PDF document text
    • https://cdn.sqhk.co/sexipemajim/iajaAkd/build_battle_hypixel_stats.pdfIn PDF document text
    • https://cdn.sqhk.co/losajaro/hhdjj1N/6890573747.pdfIn PDF document text
    • http://health2health.online/forklift_daily_checklist_word_document75ck4.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/15875890787.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/idBgjhd/robots_coop_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/nqific1/merchant_of_venice_characters_ppt.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/10311753206.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janutozekim.epizy.com/inventory_stock_take_template.pdfIn PDF document text
    • http://kozosakesaganu.epizy.com/pisuwurulategewofubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46c1c9d-6271-43b3-aafa-fc8cfe1f87f1/gk_maths_questions_and_answers_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3133a07e-f059-49fd-8ba9-116f1c070b95/trombosis_venosa_superficial_tratamiento_natural.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_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 5228 bytes
SHA-256: a3a29b28da90c5b8f2bba0534b20cb208dcd2eb5069c32c60636eee3e0586a9c
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 10988 bytes
SHA-256: fcc52fb0e61f3326e76af528bdb13919b12d9af4255af98063b5e3b692047ff1

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