Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33d2260a0f473d9…

MALICIOUS

PDF

78.1 KB Created: 2021-04-05 17:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f63fa1ea2d3190014c4cbd3a1327c19 SHA-1: 8cb8a180c39dc4f7cf99a24a34a99cccd71dfdff SHA-256: b33d2260a0f473d98257b09a42e7ff56c3fe89a7162011793ea5eeb9acb10aae
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search query, likely intended to trick users into clicking it. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it may have been generated by a tool that can create PDFs from web content, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=hamlet+act+1+scene+3+summary+sparknotes
    • https://cdn-cms.f-static.net/uploads/4467027/normal_6045e4f9ddcda.pdf
    • http://miromawetibikew.mywebcommunity.org/noughts_and_crosses_book_analysis.pdf
    • https://cdn-cms.f-static.net/uploads/4479906/normal_603aa22776358.pdf
    • https://cdn-cms.f-static.net/uploads/4455916/normal_6051a0b431a35.pdf
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ff7738f32b02.pdf
    • https://static.s123-cdn-static.com/uploads/4417675/normal_5fcc694fdbef1.pdf
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5ffe7e4180a69.pdf
    • http://wigojomet.22web.org/foxconn_n15235_lan_drivers_windows_xp.pdf
    • https://cdn-cms.f-static.net/uploads/4389355/normal_60152ac0a73a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dizoran.epizy.com/92032943430.pdf
    • http://jeropufa.epizy.com/convert_to_word_online_gratis_tanpa_email.pdf
    • http://zonadomafi.rf.gd/big_green_egg_manual_and_cookbook.pdf
    • http://pejebitopaw.rf.gd/xunikosuzuwilotibesameb.pdf
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_270181ead6824dc6ac8086013073cd4e.pdf?index=true
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_6562e766052b4ef0abd8b3a9d53d782f.pdf?index=true
    • http://jiwuwusa.epizy.com/ribebubepunupusoxumopuve.pdf
    • http://sorufemizifolug.rf.gd/94491807664.pdf
    • http://bifikaximeme.epizy.com/cambridge_latin_course_book_4_answers.pdf
    • http://gubawakelu.onlinewebshop.net/rebuwizijuxazovo.pdf
    • http://pewejexuti.rf.gd/equidad_de_genero_en_nios.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f335.bin
6b22893bdc9a874b6fc40d40b5243dc306a3fc35ce7ab8244a95213190c6dc6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 5420 bytes
font_01_sfnt_off0001059d.bin
afbc4a89b8d8e194c87b3b3de19637255209f275d4ae80fe0d4bdb65df6b23fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 11148 bytes