Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5282954867f003…

MALICIOUS

PDF

89.0 KB Created: 2021-03-29 19:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: be10d5516b986d9c09a7612f47c7dcb2 SHA-1: 9828dc86bc074a707a7cbdf1f75ef5cee8e006fb SHA-256: ca5282954867f003e3b453ea92e72799361f1df38af416d3ccc6b5a453279ffd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'vilenefex.ru'. The document body, though heavily obfuscated, appears to be a lure related to a book search, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of many external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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=steven+pinker+enlightenment+now+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381756/normal_60291c3abf1f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501367/normal_5ffb55ad66059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_60165565be7e9.pdfIn PDF document text
    • http://luzofogobud.22web.org/78613168653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444113/normal_5ffaa2801ab8e.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/essay_written_in_apa_format_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493905/normal_5fdad3a44d7f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454965/normal_60065e2463342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fcef07c78344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_604a03d64e4d3.pdfIn PDF document text
    • http://tolumibawaka.iblogger.org/energia_elica_como_funciona.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/17757764824.pdfIn PDF document text
    • http://xazixovabifin.medianewsonline.com/75048455199.pdfIn PDF document text
    • http://pixodizelevow.22web.org/light_reflection_and_refraction_class_10_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodobokojezaga.epizy.com/lufenirovefikagimuregaj.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/cuentos_cortos_en_ingles_para_nios_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/customer_sales_representative_interview_questions_and_answers.pdfIn PDF document text
    • http://tetuzufolotozop.epizy.com/nosusodabaj.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/ielts_answer_sheet_sample.pdfIn PDF document text
    • http://bebewijelukisa.epizy.com/genie_pro_screw_drive_cm8600ic_a_manual.pdfIn PDF document text
    • http://sedijinuv.epizy.com/kumilotodekoputeve.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/40633682220.pdfIn PDF document text
    • http://jinugiwi.atwebpages.com/29669152515.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/ernesto_che_guevara_books.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 5424 bytes
SHA-256: 52e77ae0ea3e50117ac466eec581cdb7fee2a5f8d6f5de4bc0ba752a2b86eb3f
font_01_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 11676 bytes
SHA-256: 0941d5e95cabd6908c11361412e5f32d2e1001d37275815888ccc2620b37b625
font_02_sfnt_off00013f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0B 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073