Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8fd5678e11f289…

MALICIOUS

PDF

67.5 KB Created: 2021-06-01 10:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87b18fc6d76dde9eca73967dab42ba40 SHA-1: 71fbc2b4823b9a1ed4e5b9c6b3e9be1ef98e8f21 SHA-256: bb8fd5678e11f28917e6087a50ce42673640cf4448886d6add02f28f1cae82c6
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a high probability of maliciousness based on ML classification and ClamAV detection. The document body, though heavily obfuscated, appears to be related to the URL, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/pbw?utm_term=calculus+volume+1-op.pdf
    • https://cdn-cms.f-static.net/uploads/4476946/normal_606a96cb7bb1c.pdf
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5ffa29ce7d79c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dipoziw.pbworks.com/f/yeni_balayanlar_iin_kolay_karakalem_almalar.pdf
    • https://uploads.strikinglycdn.com/files/73f47be5-fc33-451e-a100-bd029666bc2c/1544131624.pdf
    • https://uploads.strikinglycdn.com/files/3edbd0c2-31da-432f-ba11-e5198c03028b/manufactura_ingeniera_y_tecnologa_kalpakjian_7_edicin_gratis.pdf
    • http://sepaxebi.pbworks.com/f/fukifevilevigujunu.pdf
    • http://wiliser.pbworks.com/f/lifespan_development_boyd_download.pdf
    • http://ziduzobif.pbworks.com/w/file/fetch/144436557/actividades_verbos_regulares_e_irregulares_6_primaria.pdf
    • http://lekipirunezi.pbworks.com/f/bulurilikajepikopesazuz.pdf
    • http://sodopateduke.pbworks.com/w/file/fetch/144419886/which_country_was_not_apart_of_the_triple_entente.pdf
    • http://wiwedano.pbworks.com/w/file/fetch/144425085/27899630881.pdf
    • https://uploads.strikinglycdn.com/files/2002eb94-3664-40a4-8819-3e66d7be036e/44425423897.pdf
    • https://uploads.strikinglycdn.com/files/83a6dc55-f17f-4edf-b7df-dd29a17bd7a2/memepirefobobupejuzefumu.pdf
    • http://foziwedugumu.pbworks.com/w/file/fetch/144441384/how_to_clean_scansnap_ix500.pdf
    • http://pamotekegopa.pbworks.com/w/file/fetch/144449205/29757266872.pdf
    • http://lugozamuxika.pbworks.com/f/how_to_use_push_to_talk_on_discord_mobile_while_playing_games.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_off0000ccf1.bin
b50d0c61cc61a0824b30e72140846442904a96b7dbec263dd2b6717de26d011d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 5284 bytes
font_01_sfnt_off0000def3.bin
7117315ef6123a280b090d289f8ef0cf362f0c83effa8bf0f33e932c31678928
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 10520 bytes