Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fe5e89e6ef69e0…

MALICIOUS

PDF

82.1 KB Created: 2021-02-28 06:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2cf551622df5371aa0bd5fd1c39c885 SHA-1: 5f1f050482086a9f83c927cbaf36397d324bc13c SHA-256: a9fe5e89e6ef69e011feef3ca01920f299215e0ecda72c994b8b37020bd5bd5a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that likely serves as a lure to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+much+is+geoff+ramsey+worth PDF link annotation
    • http://mivukiwoluwuj.iblogger.org/ungreased_baking_sheet_definition.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/articles_about_human_trafficking_in_the_united_states_2020.pdfIn PDF document text
    • http://wameduxuka.iblogger.org/vue_admin_template_bootstrap_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486772/normal_5fc91d0c6cea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fdb9af6aa900.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/6089865634.pdfIn PDF document text
    • http://vazosuzited.22web.org/reading_comprehension_grade_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5fd91d69997a7.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/tv_guide_west_australia_perth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_600e0d6fc9454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_6036d076300f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/once_minutos_resumen_de_cada_captulo.pdfIn PDF document text
    • http://setukodabirez.epizy.com/burax.pdfIn PDF document text
    • http://jevusavisa.epizy.com/81580288371.pdfIn PDF document text
    • http://wafubarig.epizy.com/bagan_tourism_information.pdfIn PDF document text
    • http://lizolejixo.rf.gd/77552815994.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/does_tegrity_record_your_screen.pdfIn PDF document text
    • http://fizufanotujo.epizy.com/59623228808.pdfIn PDF document text
    • http://vipuzala.myartsonline.com/degojowabijano.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_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 5420 bytes
SHA-256: c87e50b57929bde7e2a24748ebb1ca7806371861351ccc2f85846d9958489160
font_01_sfnt_off0001139a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139A 11504 bytes
SHA-256: 158187f1ed7d717d80997fe1db1af19f3d75cba039faa91d71e4a9da710faf86

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