Malicious PDF — malware analysis report

Static analysis result for SHA-256 52afcaa81b377d2f…

MALICIOUS

PDF

81.0 KB Created: 2021-02-23 00:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a68c9037ad341285a23871a4aeca68f4 SHA-1: 6da06b2f5e0b4432fa7b1bf3f93c0a725d12df5d SHA-256: 52afcaa81b377d2ff155653b8e7b1f5f7a88d3356efdec9e9fc93f8dcf68ab18
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple embedded URLs, including one pointing to 'leonvi.ru', suggests the document is designed to redirect users to potentially harmful websites. The 'wkhtmltopdf' authoring application and the PDF structure further support its use as a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=yoga+poses+names+for+beginners
    • https://cdn.sqhk.co/buzomesil/jfjaplS/21543510715.pdf
    • https://cdn.sqhk.co/vulovosovem/cI7Hic5/7_years_old_lyrics.pdf
    • https://cdn.sqhk.co/kuruwoke/idkgfgU/82890315253.pdf
    • https://cdn.sqhk.co/ximegawaso/jhjdtyz/coc_th13_farm_base_link.pdf
    • http://juwolopuga.66ghz.com/jiravajemarekopenajemajur.pdf
    • https://cdn.sqhk.co/ximegawaso/ChdWQ7R/build_a_bear_harry_potter_cost.pdf
    • http://fruits-summer.fun/butepajimolaliwusupakil183w.pdf
    • http://fortuneo-enligne.com/2605283891llzgz.pdf
    • https://cdn.sqhk.co/vibisidumes/fRhd3hb/injustice_gods_among_us_mobile_free_characters.pdf
    • https://cdn.sqhk.co/kigaratak/cFxG2ig/lufevidejewusowu.pdf
    • https://cdn.sqhk.co/fapewakuw/hjgggdP/colony_bmx_bikes_review.pdf
    • http://zespodsvetkoy.site/61057076597lkhvk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wusozugidiwe.rf.gd/classroom_management_book_study_guide.pdf
    • https://s3.amazonaws.com/firudegix/4127692303.pdf
    • https://s3.amazonaws.com/boxalewijim/diriwarivalena.pdf
    • http://pozadel.epizy.com/83330471494.pdf
    • https://s3.amazonaws.com/nefunupu/faxagirofa.pdf
    • https://s3.amazonaws.com/suxuzubojut/77165228321.pdf
    • https://s3.amazonaws.com/xukirizugukugi/98249639366.pdf
    • https://s3.amazonaws.com/jubiferekaka/34073078939.pdf
    • https://s3.amazonaws.com/tubupejevomo/73133014532.pdf
    • https://s3.amazonaws.com/zabejuvijolu/blood_stone_movie_free.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_off0000ffde.bin
235f6c1c22b6d88fd24ccf00a7dd2ea2317cb80530352a2858f0db481a7a5c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 5292 bytes
font_01_sfnt_off000111ca.bin
ef86591241d6f96f526e24892702fe664d90c8550c7c65c79bf264f047a1c484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 10836 bytes

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