Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b3380f4bc7a118…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 00:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 792fcd7a33c4b2c048ca57a433a2a58c SHA-1: f0cb7c76d2a59d7e223c3a027ed97448a27fe408 SHA-256: b7b3380f4bc7a118b9c270bdfd3bb971a0182494b4b3b76fa6103ec0479400fa
96 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'https://kuzutuzo.ru/strik', likely intended to redirect the user to a malicious site. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to download or redirect to a secondary malicious payload. No scripts were extracted from this sample.

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=old+girl+scout+handbook+brownie+story
    • https://tunedewujanan.weebly.com/uploads/1/3/5/3/135345761/8846b31be7014.pdf
    • https://meruxanige.weebly.com/uploads/1/3/1/6/131636855/gixusogetalofifaves.pdf
    • https://cdn.sqhk.co/detazido/idhaifo/text_sticker_maker_for_facebook.pdf
    • https://koworuvixoduto.weebly.com/uploads/1/3/4/3/134352933/wekodiwa.pdf
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/7968016.pdf
    • https://cdn.sqhk.co/nukusigemug/djeEii3/dead_eyes_comic_online.pdf
    • https://cdn.sqhk.co/dafisuwikib/ihhaTvM/luzuxumadetajepapejelot.pdf
    • http://xifutuvetowa.iblogger.org/worewozemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_fc9f16e3ad904323b6b23dab0ba16d62.pdf?index=true
    • http://vurisadazuxe.epizy.com/27832913305.pdf
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_6320f56cfd6543c7a10ae508e9b9926f.pdf?index=true
    • http://jenetaponolinev.rf.gd/ge_healthcare_human_resources_phone_number.pdf
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_27ab42cc99de4f66817fe96e1cad3c02.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce3f2d17-feea-46d5-8972-0f3bafbdc3d2/how_to_reset_a_genie_garage_door_remote.pdf
    • https://uploads.strikinglycdn.com/files/3603144e-3d7a-4112-87d1-15214c18d165/windows_7_ultimate_32_bit_torrent_download_kickass.pdf
    • https://uploads.strikinglycdn.com/files/5dd473f6-2c69-491c-ad33-e5d32d86d40f/how_to_use_walgreens_ear_thermometer.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_8abc09d5f5a240ebb7eee597c49897a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf157b42-7d26-4277-a50f-8aba84d62e4d/end_of_life_software_management.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_off0000f18f.bin
a827844d2f6a044f1e80f583fe61e4a2ab74d497cfed472ccc3dc4738649bfa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5628 bytes
font_01_sfnt_off000104c7.bin
7b83e5b3311252f705db605c6c72e81913c1a3a125fd7050af841701a0c61f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 10484 bytes

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