Malicious PDF — malware analysis report

Static analysis result for SHA-256 485b08708dd60d3d…

MALICIOUS

PDF

75.7 KB Created: 2021-04-10 19:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8c5e4747e0fcba418b7cb626b92727cc SHA-1: 8c4fce28713225f96a6d4cae87fa294de3d8575b SHA-256: 485b08708dd60d3d496e9cc3b9bfcd9dfd2bf8657eb50c1e0246a7763e62faf6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed for SEO manipulation. The primary malicious link, 'https://dafemum.ru/strik?utm_term=adobe+xi+standard+serial+number+location', suggests a phishing or malware distribution lure related to software activation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=adobe+xi+standard+serial+number+location In PDF document text
    • https://cdn.sqhk.co/terodekijur/iiiijay/nedebajut.pdfIn PDF document text
    • http://xobilosusi.sportsontheweb.net/36113810383.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hijAZvr/jurassic_survival_island_2_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/midubevine/jghh9ih/73966696937.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/i9hfjeu/29592931952.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/agfiijb/zoxokikobanejofefasorekax.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/Djbjgig/disney_princess_light_up_dress_up_shoes.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/fgdhhOu/pitch_pipe_tuner_apk.pdfIn PDF document text
    • http://zaneralisobiwi.22web.org/49928203994.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/VJjeIhg/evaluate_expressions_worksheet_4th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_c15e180e24c14d75aa6b735c2b2566e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ritoma/keniguxulan.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/does_anyone_buy_used_books_near_me.pdfIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_ae11f18fcbae48b0ba0c55508b1d1b15.pdf?index=trueIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_21003f16ddee43cc946729191cb2051e.pdf?index=trueIn PDF document text
    • http://kurerori.myartsonline.com/sorexer.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_303eadb6db3f4dd5b429b67c115e81c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/pelicula_amor_en_tiempos_de_colera_espaol_latino.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/47820330023.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_721970bdca0e4bb0838e525044be9de9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/93619030362.pdfIn PDF document text
    • http://difoduniba.epizy.com/why_authors_use_short_sentences.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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 5280 bytes
SHA-256: 72479ff1407bb8df5cd8e552aea496e7879ab572ce355ea825fc475d68fbf0a4
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 11000 bytes
SHA-256: 4519746366563bea095903822f2431d654da48f3c28d2ee647a2393405b507bd

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