Malicious PDF — malware analysis report

Static analysis result for SHA-256 4468a6f01469af9a…

MALICIOUS

PDF

73.9 KB Created: 2021-04-01 09:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 23750ec16667fc80d2c7c8162ffacc7f SHA-1: aecbeb20017fb713e85253bda7415b900326d989 SHA-256: 4468a6f01469af9abceade1d75973402fcef65bdc0d9d2f06141a9a8976499fa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were extracted, the presence of external URIs and the ML classifier's high confidence score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=anesthesia+complications+in+the+dental+office+pdf PDF link annotation
    • https://cdn.sqhk.co/xetokive/dLC4FSk/kigefivowatimaxedimupodeg.pdfIn PDF document text
    • http://winoraama.space/87514268531xt8cv.pdfIn PDF document text
    • http://barberking.best/principles_of_grammar_translation_methodt8oya.pdfIn PDF document text
    • http://flowerport.store/latokevobidad1pir.pdfIn PDF document text
    • http://nukels.xyz/baofeng_uv5r_police_scannera0j91.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/idWHiiV/charm_city_kings_netflix.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/can_you_play_one_night_with_ultimate_werewolf.pdfIn PDF document text
    • https://cdn.sqhk.co/wevavagu/vicgcSG/rayovac_rechargeable_aa_batteries_reviews.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/clasificacion_de_las_empresas_segun_su_origen_de_capital.pdfIn PDF document text
    • http://derifupiwa.mypressonline.com/acca_f6_taxation_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/e0cphcg/regular_phone_ringtones_android.pdfIn PDF document text
    • http://nely.xyz/nukonokigavetovoduwilogak2xotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujiruwer.rf.gd/problems_philosophy_bertrand_russell.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/learn_arabic_language_through_english.pdfIn PDF document text
    • http://rekekolulopar.rf.gd/the_communist_manifesto_ao3.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/financial_functions_in_excel_2020.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/bhagavad_gita_in_bengali_free_download.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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 5288 bytes
SHA-256: 5faa7bf0986758418bd0933971382a86e133907e4b6a9f83877437994febefd3
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10724 bytes
SHA-256: 0b7c269cc92452f14f4ed23e9c229965d938046900970c3cace062ff3123d9d5

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