Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa131a33ca83974…

MALICIOUS

PDF

71.8 KB Created: 2021-03-08 13:25:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f44da3e5f8c9d5e80cc3f9609d9f180 SHA-1: b5acecd78abd7ffa180a5d64fc988bd469ac9e1b SHA-256: efa131a33ca8397439eb1ba5214d0d760755152b62a841292503a2dd3a0a615b
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a malicious domain used for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to 'Dave Alexander Builders' and the authoring application 'wkhtmltopdf', suggesting a lure to a fake website.

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://kuzutuzo.ru/wix?keyword=dave+alexander+builders
    • https://static.s123-cdn-static.com/uploads/4454304/normal_5fde5b5fd837a.pdf
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6023fd0c22110.pdf
    • https://cdn.sqhk.co/mukibusu/fgfveOS/country_life_harvest_day_hack_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fd9127b43152.pdf
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5fdb2c7cb5a85.pdf
    • http://rollernefritmassage.xyz/lazafenasekonuwuboliiriwo.pdf
    • http://rubyshup.space/40778812924q6j3.pdf
    • https://cdn.sqhk.co/pavoraxebute/fggiakl/uncertainty_calculator_for_length.pdf
    • https://static.s123-cdn-static.com/uploads/4389581/normal_5ff4e3d58669d.pdf
    • https://cdn.sqhk.co/rorexamuviz/fgg6gjE/hustle_castle_arena_glory_points.pdf
    • https://cdn.sqhk.co/rolaravez/cgjgjij/calendar_2020_with_holidays_and_events.pdf
    • https://cdn-cms.f-static.net/uploads/4448116/normal_6011ab19011e8.pdf
    • https://cdn.sqhk.co/mapelimujeku/hiihcI0/osborne_books_tutor_zone_chapter_activities_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_a192e49fa10042ba97cbfad6a8b15078.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_42d39b5c88204f2f8d7bd2198bb9d0bc.pdf?index=true
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_3a0df28d45404ea38975284357f59f4d.pdf?index=true
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_0191443a319446f88570a5d0f6bc89af.pdf?index=true
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_f65073e68fc14c539cb8507c65b298c1.pdf?index=true
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_7121294c15644baf8f35923af123a451.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_5ddd8023a9fe44d09640c4fbfbc037ca.pdf?index=true
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_ad03bf98f2af4b9e86a8d869099bfd64.pdf?index=true
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_35b077277a1b4fe9a1e8bf63bcfbf4c5.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf15.bin
ab1b5e0b2c478f6ea95a181a38ac9dd354e1c620320db74645b826393ad98621		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 4776 bytes
font_01_sfnt_off0000df51.bin
e9084e1a29c5dcd8fceb191ceda56e3413624da088da4f4f9c3f63654987b2fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 10700 bytes
font_02_sfnt_off000103ea.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 4324 bytes

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