Malicious PDF — malware analysis report

Static analysis result for SHA-256 4077871c56d1cd08…

MALICIOUS

PDF

76.4 KB Created: 2021-04-27 09:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 599ac5eb384035d2c1d4aea89caed522 SHA-1: ea3c479812389333c2b2cf8c1d117fa58493870b SHA-256: 4077871c56d1cd08fdbb803899825897d7538a1e0487f5cf55d5baa7cb0f889b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, several of which point to known malicious redirectors and disposable hosting. Heuristics indicate the PDF is a link farm and a malicious redirector, with a high ML classifier score and ClamAV detection confirming its malicious nature. The primary purpose appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=jon+duckett+javascript+jquery+pdf+chomikuj In PDF document text
    • http://zibikudupe.mywebcommunity.org/tajefonafegiwusaxajumu.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/gevifurefuxuxekon5dfr.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/jaXJDbl/gidexuxibef.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/Zii2xn7/46648781871.pdfIn PDF document text
    • http://xojanefod.mygamesonline.org/aubade_philip_larkin.pdfIn PDF document text
    • https://cdn.sqhk.co/bufudoraxala/d5uzNx9/98721746193.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/ggjgjay/pijufufavinijolarudepubo.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/djjfWhb/aged_care_guide.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/3374058001tvqzt.pdfIn PDF document text
    • http://nakijeku.mygamesonline.org/cabinet_minister_list_2020_download.pdfIn PDF document text
    • http://goodsun.space/brother_mfc_8480_drum_resett3x3b.pdfIn PDF document text
    • http://voiprormul.xyz/human_trafficking_newspaper_articles_australia7pa6e.pdfIn PDF document text
    • http://evilcheats.fun/monimulifaragetuzejadifai5qz2.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/cw1jjr9/pumejarepezuli.pdfIn PDF document text
    • https://cdn.sqhk.co/rowojazur/5S0jajb/horizon_credit_union_internet_banking.pdfIn PDF document text
    • http://sparzha.club/vixubawodadobevogb66m.pdfIn PDF document text
    • http://chambrehub.xyz/37971135858s5goj.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/zazakijevaxawovupozujenuk.pdfIn PDF document text
    • http://reduslim-officialsite.site/how_to_use_auto_threader_on_singer_sewing_machinenrszx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/aceite_esencial_de_eucalipto_propiedades.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/biharwap_in_bhojpuri_movie_2018.pdfIn PDF document text
    • http://taguloxutenafol.myartsonline.com/fowasapakokax.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/twilight_saga_eclipse_full_movie_in_hindi_download_480p_filmymeet.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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 5780 bytes
SHA-256: 6f3b1b8b233c698120874b748c7afcebb3fcf2fcd3a2cbba4b18d6741e050d64
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 11216 bytes
SHA-256: 69ee140d05dc1d0ec334225e55dae85436ecd9ed9ee875f56233278c8e89b95c

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