Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e75088f7916002…

MALICIOUS

PDF

75.1 KB Created: 2021-04-04 04:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7e78677f8360327b773dc49aa82d9f4 SHA-1: 20969852f86a8cb60c4e3940869037ab8b48487e SHA-256: 31e75088f7916002b3b92131320f1684a86524e767d5b3ee0bf0a46eecb22480
96 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, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a book search, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=book+of+esther+kjv+pdf
    • https://mitixomog.weebly.com/uploads/1/3/4/8/134859124/josad.pdf
    • http://vixemifojetinag.sportsontheweb.net/die_buddenbrooks_buch.pdf
    • https://tabowemonikose.weebly.com/uploads/1/3/5/9/135957185/3dc1083bffcc5.pdf
    • https://static.s123-cdn-static.com/uploads/4489975/normal_5ff95e30a1835.pdf
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/rolunapam_lifudet.pdf
    • http://themarkuzmusic.com/detabituxemujevotul2759n.pdf
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/lebubatugum.pdf
    • https://gekonoxare.weebly.com/uploads/1/3/4/4/134480638/gosasabagur-gexomaxul-befexunarexi.pdf
    • https://cdn-cms.f-static.net/uploads/4414498/normal_6054475318453.pdf
    • http://sibuvre.com/zamogirijutewawozaribiwuvt7kmd.pdf
    • http://g2am2e.xyz/tazokumadosepv3.pdf
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5ffbc64453cfb.pdf
    • http://bitoxifa.sportsontheweb.net/certificato_di_residenza_autocertificazione.pdf
    • http://xidotamasaw.22web.org/formule_excel_arrondi_entier_inferieur.pdf
    • http://jiwapadenejeza.getenjoyment.net/norcold_refrigerator_quit_working.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tujiritam.epizy.com/putivukijatapititepojizux.pdf
    • http://fefadipif.rf.gd/crise_asma_tratamento.pdf
    • http://vutogebufuz.myartsonline.com/3554899632.pdf
    • http://puxalalofevan.rf.gd/36977387095.pdf
    • http://suregemebibu.rf.gd/logical_reasoning_questions_and_answers_for_class_5.pdf
    • http://tadiwolavis.epizy.com/como_hacer_manualidades_con_botellas_de_gaseosa.pdf
    • http://dakunexafabeve.epizy.com/7862045475.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_off0000ea17.bin
4eb018131b2023d49439fb162d4267b571ff9a3548f01f408a51f15a2209ac1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 5136 bytes
font_01_sfnt_off0000fba3.bin
951072b4eb56e088b2387d2453201e1f1967890d21b4aab355e8be2177868e78
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 10460 bytes