Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4226705dbd635b…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 03:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 62717f9e6f049e3109300460f05152ec SHA-1: 91c0cdf88f750e8ad959aa030e7bfb93d9dd99e1 SHA-256: 5b4226705dbd635b98c929db430377d9cef71a15457e99e506069d63cd9ee982
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing lure. The document body, though heavily obfuscated, suggests a theme related to sheet music, which is used to disguise the malicious intent of directing users to a potentially harmful URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/award?keyword=south+african+national+anthem+sheet+music+satb+pdf PDF link annotation
    • http://vizemezezu.sportsontheweb.net/51009301455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_60340e1fe771c.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/poggio_bracciolini_facezie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_601aea0940b9a.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/amplificador_fender_mustang_1_v2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6016e308f3935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_603387754184c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_60314ac997618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_5fd822e227e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_6055454963f60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_601b8ff773b2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/3393274644.pdfIn PDF document text
    • http://fazatela.myartsonline.com/boy_scout_popcorn_order_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/93482883247.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/voice_changer_app_for_discord_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/pununi.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/static_and_kinetic_friction_lab_report_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/bepanah_pyar_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/que_es_el_liderazgo_en_la_iglesia_cristiana.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/layers_of_the_earth_density_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/13681510771.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/rikaxokosak.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/buell_blast_parts_manual.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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 5636 bytes
SHA-256: 65172c88adc32bbc38485323a3314f8b774105573d73f5a1371b14f6ed64c53d
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 11556 bytes
SHA-256: 6015ad79f3f5012b75ee27e47e667ef7d01c5ce2c90a86aa840b2bf666f47b0c

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