Malicious PDF — malware analysis report

Static analysis result for SHA-256 785a5d15f538ea88…

MALICIOUS

PDF

77.7 KB Created: 2021-04-24 04:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a4369b9202060509219b4de9c8caccb4 SHA-1: 2a123957cb77c754e48c09d3839e86ed4ae22a83 SHA-256: 785a5d15f538ea881c96538d4a7e3ff44802ffa50fd1690afcbde598db62cf3c
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to "sword art online fatal bullet wikia", likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=sword+art+online+fatal+bullet+wikia PDF link annotation
    • http://pijojavoto.mygamesonline.org/21663226886.pdfIn PDF document text
    • http://pelabinowoguk.getenjoyment.net/64545284235.pdfIn PDF document text
    • http://lavkavkusa.store/rugiwevekenogipegumn3q9m.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/55612532750.pdfIn PDF document text
    • https://megewesaj.weebly.com/uploads/1/3/0/7/130738707/6659791.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/pasijagubamedixexomenoses.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/kukifemiko.pdfIn PDF document text
    • http://taduzexemi.22web.org/bakifabumovurovozasabam.pdfIn PDF document text
    • http://mmeueue.space/dixewivetudi906o4.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/67547488865.pdfIn PDF document text
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/4218617.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/risitoxe.pdfIn PDF document text
    • http://pakizimavom.scienceontheweb.net/is_cna_certification_hard.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/1793117.pdfIn PDF document text
    • http://lufosopaxukil.getenjoyment.net/9211563920.pdfIn PDF document text
    • http://golumebaxob.22web.org/ncert_grade_5_english_textbook.pdfIn PDF document text
    • https://vevilatibivu.weebly.com/uploads/1/3/6/0/136082609/9401712.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/causas_de_esclerosis_multiple.pdfIn PDF document text
    • http://aduo5.online/39810376063l4qu1.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/94491001961.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teraropabu.epizy.com/how_to_get_starbucks_employee_discount_on_app.pdfIn PDF document text
    • http://digudago.rf.gd/learning_astronomy_by_doing_astronomy_answers.pdfIn PDF document text
    • http://zevusup.atwebpages.com/dujuvubosadatokasag.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_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 5124 bytes
SHA-256: 6c38437a6cf86e237c7bf110ca41e263ea1d604636add1b06a95c57281a76665
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 11132 bytes
SHA-256: d6f089ee8fc5d5014707c8d2eac33685d999b284577391c60864c613b65ba9f5

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