Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7966f2e85ab060…

MALICIOUS

PDF

77.3 KB Created: 2021-05-06 19:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 259c489e727c95a6924fcdb86becbeaf SHA-1: 20627e1193f75a54e0e126b1bc983e7dab303d8e SHA-256: 8f7966f2e85ab060a5b0154ce018b5a9f49d9d2b0467e65313d82abb1a552beb
186 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm, containing a significant number of external URLs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure suggests it's designed to lure users into clicking these links, which could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=deep+house+electronic+music+artists PDF link annotation
    • https://cdn.sqhk.co/jiliroba/arnjjfF/fanotaluloxivedomazozip.pdfIn PDF document text
    • http://com-signto2.xyz/wiiflow_latest_version_2019_download159l6.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://xbet1.fun/196063501381gaxt.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/ijfzXjf/idle_empires_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/iX3hhid/53099630252.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/BNeCihI/papovuruvenesafopox.pdfIn PDF document text
    • https://cdn.sqhk.co/medijuret/g2icSje/free_customized_t_shirt_design_template.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/dDidrOL/nigulobasosaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/hiaichj/vugiturazisaretile.pdfIn PDF document text
    • http://espacecmb.xyz/gifowubimunibiperylq.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/Glehhge/matufilefimunox.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/jgjcgd0/pajivebuwunevexoviwep.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/hbuwxyM/dujegesutawoxuxamemevixu.pdfIn PDF document text
    • https://cdn.sqhk.co/tonufipu/ejhSr4v/lorixizunusexizule.pdfIn PDF document text
    • https://cdn.sqhk.co/godidudawat/T6gcXhg/spelling_bee_practice_words_second_grade.pdfIn PDF document text
    • http://pedrons.space/werewolf_online_mod_apk_see_all_roledpm7p.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/jaYTfjd/91806576888.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/dapekufoxiraku/ridekixomipor.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_468e5c022dda475d9a0413a0cf5e35f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/miwevujopujemilopeg.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_7bbfc4e54b0749119283fff254a22544.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_059a0bc60a204a41819101d8068f756a.pdf?index=trueIn 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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 5172 bytes
SHA-256: 5be3c56cddfa354dedcfdf0898efc06f93692f63c42ebc4b9114b12aea214561
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 11780 bytes
SHA-256: 09a41ca605b4f4ac2c34e1b1ffe7bd2521ccac85dc1d8715a064095d73f7da3c