Malicious PDF — malware analysis report

Static analysis result for SHA-256 7021ad8f16720e71…

MALICIOUS

PDF

73.9 KB Created: 2021-03-11 10:35:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b66e1811409b4856bbfc977fae9c71d0 SHA-1: d76062e8af701c5cdaacbd1051e73edc013f1c90 SHA-256: 7021ad8f16720e711ebb99b94443d0a60eb065bbbb8c38f28953d305f7837509
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 URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to calculus problems, likely intended to trick users into visiting the external URL. No scripts were extracted, but the presence of external URIs and the malware classification strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=calculus+derivatives+problems+and+solutions+pdf
    • https://fezugewibopav.weebly.com/uploads/1/3/5/3/135346468/nofusadi.pdf
    • http://lozipazom.sportsontheweb.net/vajanabenatex.pdf
    • https://cdn.sqhk.co/rorazelesu/DxhehgM/serepibanipewax.pdf
    • https://mejavepo.weebly.com/uploads/1/3/1/4/131438157/xuxos.pdf
    • https://cdn-cms.f-static.net/uploads/4427781/normal_60374538ad261.pdf
    • https://cdn.sqhk.co/marixefe/hjhickr/taxi_sim_2020_pc_download.pdf
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/3463087.pdf
    • https://static.s123-cdn-static.com/uploads/4454672/normal_5fcaa2b632285.pdf
    • http://lozhobelir.space/8572285282749ar1.pdf
    • https://cdn-cms.f-static.net/uploads/4379964/normal_601aa8e50f361.pdf
    • http://idealica-italy.site/limites_de_funciones_irracionales_ejercicios_resueltos5mrs8.pdf
    • http://idealica-italiaufficiale.site/juwetibobeziparezusovumamy5ci.pdf
    • http://geparup.scienceontheweb.net/galaxy_a10_review_techradar.pdf
    • https://cdn-cms.f-static.net/uploads/4408701/normal_6010720242d8a.pdf
    • https://zufefofavenubu.weebly.com/uploads/1/3/0/7/130775539/4155067.pdf
    • http://pifowovumuwe.medianewsonline.com/what_is_lscs_delivery.pdf
    • http://webmastervlad.ru/ronazaboludiwigosobxgusr.pdf
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/3672119.pdf
    • https://cdn.sqhk.co/poxufape/4iemThh/68808694803.pdf
    • https://cdn-cms.f-static.net/uploads/4375203/normal_6041e0fa179ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ravuxudibure/love_yourself_album_answer_songs.pdf
    • https://s3.amazonaws.com/wunojipu/34623443115.pdf
    • https://s3.amazonaws.com/pegozegi/wrapping_paper_mockup_psd_free.pdf
    • http://gurabagoderes.atwebpages.com/whats_coming_to_disney_world_in_2021.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_off0000e4f0.bin
c13658fca1de46c753a282c31580d0d915174115c44140019e08b9172fb9a128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 5408 bytes
font_01_sfnt_off0000f737.bin
a304a432c80bf773cfe172370f079f8c736e6f941062b683058d83c5b244ddd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 10256 bytes

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