Malicious PDF — malware analysis report

Static analysis result for SHA-256 404b6fa04c1f5586…

MALICIOUS

PDF

80.2 KB Created: 2021-04-12 15:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ba713d1e2be2016c3412b215603f21c SHA-1: 1056978f070fa1c1a8eb50f24d21dffc32ea1c7a SHA-256: 404b6fa04c1f5586d01a54811536aed3fc26ac0e2971c67ea6d91398cc6598fc
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URL pointing to 'kuzutuzo.ru', which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to an ebook, aligning with spearphishing tactics.

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://kuzutuzo.ru/strik?utm_term=this+bridge+called+my+back+ebook
    • http://fujabum.iblogger.org/how_to_tell_if_you_have_a_double_dapple_dachshund.pdf
    • http://usecabinets.xyz/rs3_familiarisation_guidepehuv.pdf
    • https://cdn-cms.f-static.net/uploads/4466146/normal_601c7d9a247a3.pdf
    • http://sazijanisa.22web.org/yearning_to_breathe_free.pdf
    • http://mewajopu.22web.org/center_of_gravity_method.pdf
    • https://cdn-cms.f-static.net/uploads/4414176/normal_606e0070cf1ad.pdf
    • http://bowofonu.22web.org/gebad.pdf
    • http://kinoxca.xyz/13248965788730cm.pdf
    • http://wildboost.club/23615403723d9vd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8eecfcb4-07ab-455c-bd44-c058efc67d17/wowwee_robosapien_app.pdf
    • http://zojimako.rf.gd/vigowuvur.pdf
    • https://uploads.strikinglycdn.com/files/aba7b492-0162-4145-840b-0cbb668bf468/sacred_pathways_gary_thomas_test.pdf
    • https://s3.amazonaws.com/xirixepo/puerto_rican_rice_recipe_sazon.pdf
    • http://nufagogofuj.epizy.com/barron_s_essential_words_for_ielts.pdf
    • http://gokakotafabap.rf.gd/nizemigulilajovon.pdf
    • https://s3.amazonaws.com/xomepixo/zoniviza.pdf
    • https://s3.amazonaws.com/vufuzewasi/18252868705.pdf
    • https://uploads.strikinglycdn.com/files/96aad613-d96a-4d8d-939a-b332a7e0c4a4/53462374434.pdf
    • http://kexasejuwodeji.epizy.com/nadudodexaxebinave.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_off0000f9c5.bin
a992f546817d38eaa670e3a7a4b675e40b7addbf8389b3049bf1829e761d2a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 5608 bytes
font_01_sfnt_off00010cb3.bin
fdaa88e7a10fc8e1be7136529c418f688b3ef6a6632a3df90e063223d90c548d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 11416 bytes

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