Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f82e2a0d9714c2…

MALICIOUS

PDF

73.1 KB Created: 2021-03-31 18:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c82595901ae296e4420c0ab1f0e39fde SHA-1: a8e2b9b2e2c34867aec3d465ac28336ea910fb18 SHA-256: c4f82e2a0d9714c25f2feb83c840a1f261992cdcc98add12a41b5814c2c270b8
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, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=dark+souls+3+anri+catacombs PDF link annotation
    • http://servisvds.ru/what_does_an_associate_hardware_engineer_dortg3e.pdfIn PDF document text
    • http://study-english-04.space/adobe_illustrator_android_modjska5.pdfIn PDF document text
    • http://fallofelin.online/nebewojigadgwrie.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/nunowagimabut.pdfIn PDF document text
    • http://world-wild-shop.com/10957468933n3bha.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/matajajujipeg.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/jGqNmjd/ayoba_free_instant_messaging.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/jdjftge/private_text_messaging_secure_texting_calling.pdfIn PDF document text
    • http://garant-ritual.online/kitchenaid_coffee_burr_grinder_reviewuymjg.pdfIn PDF document text
    • http://kidobujugi.mypressonline.com/britannica_encyclopedia_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/iiehiM1/free_bubbles_vector.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/p7YJiaS/capstone_clinic_parrish.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jimugivos/41087772568.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/16604104928.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/gejala_sepsis_adalah.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/officejet_pro_8620_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ed375d-9316-4dd3-b190-870403e1ebaa/how_to_install_a_clock_movement_kit.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/subtraction_with_regrouping_worksheets_for_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75953768-09ef-4662-ad52-cad23ce6cbf4/inter_tel_cordless_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/consumer_reports_best_rated_car_seats.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 5312 bytes
SHA-256: fce75b7fe4aed293f8734c84573e970bfc252fc84f9e45f672176137c47b64d6
font_01_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 11240 bytes
SHA-256: 58142c11f6c44932dcd9f5d15e384ef0f69e7eaa6c123afa9f91eed8cf21ee50

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