Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfe9d0da35fcc07…

MALICIOUS

PDF

75.8 KB Created: 2021-04-04 20:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11e06f0afefef6450b151d94295347d9 SHA-1: 50ab212dbad83b315297273a3c3eee235a1bf84b SHA-256: 3bfe9d0da35fcc0784fa8829044b307e98e92d02bc3c20f4fe096b2754cf71f3
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, suggesting it's designed to redirect users to a potentially harmful website. The document body, though heavily obfuscated, contains strings related to wkhtmltopdf and a date, which are common in phishing lures.

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://resalured.ru/strik?utm_term=which+structure+that+best+fits+this+image
    • https://dixoparogazasa.weebly.com/uploads/1/3/1/8/131871726/74f54ad.pdf
    • http://kosiwixiwumizu.iblogger.org/wondershare_video_editor_for_android_free.pdf
    • https://kuzuvofaneze.weebly.com/uploads/1/3/5/3/135394893/669143.pdf
    • https://cdn-cms.f-static.net/uploads/4460055/normal_600a6582bd81c.pdf
    • https://cdn.sqhk.co/jinubodilev/M5mhbZc/3350235031.pdf
    • https://beredixe.weebly.com/uploads/1/3/4/7/134762790/5e61a38cc8723d2.pdf
    • http://niludop.22web.org/solobanupasonepiza.pdf
    • https://cdn-cms.f-static.net/uploads/4481402/normal_601b64ffeb57a.pdf
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5ff04883006e5.pdf
    • http://dofapupore.22web.org/why_does_my_brother_printer_print_blurry.pdf
    • http://tizisewe.22web.org/pedopija.pdf
    • https://cdn.sqhk.co/muzipajat/libGTic/22407400800.pdf
    • https://nalatuzub.weebly.com/uploads/1/3/4/3/134324595/dobodajag.pdf
    • https://cdn.sqhk.co/fusajovogi/V0JjcQ5/jipozipovuvosuxo.pdf
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/fb66529b7889.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuxenipup/32182521307.pdf
    • http://gexazavere.epizy.com/animal_body_parts_printable_worksheets.pdf
    • https://s3.amazonaws.com/zetituri/animal_farm_chapter_2_summary.pdf
    • https://s3.amazonaws.com/dorulusof/be_alright_dean_lewis_sheet_music_piano.pdf
    • https://s3.amazonaws.com/moduxanakuri/spring_boot_jdbctemplate_oracle_configuration.pdf
    • http://liwubujuwu.epizy.com/1280947480.pdf
    • https://s3.amazonaws.com/vobuturinivi/dragons_lair_release_date.pdf
    • http://witekibumu.rf.gd/chama_chama_song_video_pagalworld.pdf
    • http://vokozebutiri.rf.gd/21237185607.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_off0000ecb3.bin
37e5e38ccb45eaf377db249e86060b55d93c2d251ccc4292b3ffeed70d09d4e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 5416 bytes
font_01_sfnt_off0000ff09.bin
59f0eb165264376aea9a788043caaa6d6cb8a4cd63e9de59fb5c6180f5bbc7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 10048 bytes