Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7ffb961afa7a50…

MALICIOUS

PDF

74.0 KB Created: 2021-03-10 22:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: be4cc7650ccd5743759a0b7f39279032 SHA-1: fb128680afba11592ed7419b9af8658798eae567 SHA-256: ef7ffb961afa7a5071590631afa40219d8c0940d057fc087ba3457eeaf03dea6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a potentially malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://botokaw.ru/aws?utm_term=buzz+rack+3+bike+carrier+instructions PDF link annotation
    • https://cdn.sqhk.co/nuvexajamu/jiieTpX/among_us_skin_hack_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fokudiwun/ywhiDSg/download_blockman_go_pc_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_60479b0f1bf0e.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/MwmqjcI/11822199398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5fcd2d3fca862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_600901e04ecbb.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/jgWOA5y/gufuviwafewuwome.pdfIn PDF document text
    • https://cdn.sqhk.co/dodagirojep/cAcywgf/anime_studio_story_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_ed83269f1fce4830b80eaa35d8cbf645.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/5491359401.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/printable_work_timesheet_template.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/ethical_hacking_institute_in_ahmedabad.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/zifulekexivukalexogufix.pdfIn PDF document text
    • http://roveramo.atwebpages.com/teludo.pdfIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_3e2853f609f74680a414bb7ae004459e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/exchange_activesync_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/avast_free_antivirus_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/cambiar_archivo_a_word_en_linea.pdfIn PDF document text
    • http://kegigija.atwebpages.com/45007426028.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/97742074703.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/combined_gas_law_problems_worksheet_answers.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_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 5228 bytes
SHA-256: ee5652c77b94bbbb396aec9cdc3ac8a6c35bcb6d0c3236a36538ba06e0e80029
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10160 bytes
SHA-256: d403dd694295f39dfeb4cfec7ae7a28751bc1881f8b038353c8971d1aaeb7345

Open this report in the interactive analyzer, or submit your own file for analysis.