Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8e0a3c4dfb437b…

MALICIOUS

PDF

72.6 KB Created: 2021-03-19 00:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f342ffbd52a55955d3485c27fc309b6 SHA-1: ed18b1efa3e72194cd36d9d310cf0f078f6a48e1 SHA-256: 4a8e0a3c4dfb437b6459139d58d68332405062f0b53e515afbedccd8ce41841d
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'mezovuduw.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains text related to 'national literacy progressions', suggesting a lure to trick users into clicking the malicious link.

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://mezovuduw.ru/award?keyword=national+literacy+progressions+pdf
    • https://cdn-cms.f-static.net/uploads/4411700/normal_60160bbb3add9.pdf
    • https://cdn.sqhk.co/tutabalero/YMjbjh5/turbo_stars_mod_apk_rexdl.pdf
    • https://cdn.sqhk.co/vimexuda/h9d9Rif/bedwars_server_address_java_edition.pdf
    • http://woodbonus.net/36838844964j1cb3.pdf
    • https://cdn.sqhk.co/gujurolekuma/mgdVgdT/fimikolofulatirosovubip.pdf
    • http://italysummer.space/what_does_the_word_terminate_mean_in_englishgdo76.pdf
    • http://wow50.pro/krunker_report_hackerspkpju.pdf
    • https://cdn-cms.f-static.net/uploads/4390097/normal_6032987196fd3.pdf
    • https://cdn.sqhk.co/nugizape/Cifjigf/ludo_game_project_in_python_with_source_code.pdf
    • http://rivepozepuxar.mywebcommunity.org/kudoxopixufuvigapozu.pdf
    • http://pornbustyvids.com/88934986177q00l8.pdf
    • https://static.s123-cdn-static.com/uploads/4370764/normal_6006809b90161.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f4f6ef44-2700-4d20-ac6e-32e5a15a09d7/calories_and_carbs_in_taco_bell_steak_quesadilla.pdf
    • https://uploads.strikinglycdn.com/files/bb9a59b2-13c0-4db1-aa85-3822399b3457/wotagitijizivaj.pdf
    • https://uploads.strikinglycdn.com/files/b6e91d33-72db-49a2-83e8-1b038dadbc54/22207781941.pdf
    • https://uploads.strikinglycdn.com/files/2707935f-8a34-42d4-baba-1d76aa7a417e/inferno_dan_brown_plot.pdf
    • http://sajulugebimisu.myartsonline.com/abstract_nature_of_mathematics.pdf
    • https://uploads.strikinglycdn.com/files/05806bbb-2c2e-4d0b-a4a1-fd8128231785/how_to_find_grams_from_moles_in_a_compound.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_off0000de5e.bin
9d3187b02d36e39d58b242c4eeffd988e5ed8e106dc997e78fe27bb9e16351e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 5396 bytes
font_01_sfnt_off0000f0d7.bin
823412a38007cc6cd8f47c2e0b3f83915d72660ddfbe6c9e739a1724073b3be1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 10672 bytes