Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce19fe12c759f2f…

MALICIOUS

PDF

73.8 KB Created: 2021-04-05 01:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a1165c4e125107e4500cfb9871691782 SHA-1: 2586f453b1abeb3ec46338d3a6da040e82e759a9 SHA-256: dce19fe12c759f2fd90d6cc0bf19c275fd89446ceb969798e71bb17afdd9222d
96 Risk Score

Malware Insights

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

The file is a PDF with a high ML classification and ClamAV detection, indicating malicious intent. It contains an embedded URI pointing to a suspicious domain, 'kuzutuzo.ru', which is likely used to host a phishing page or download a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI is a strong indicator of malicious activity.

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/123?utm_term=bedjet+without+cloud+sheet PDF link annotation
    • https://cdn.sqhk.co/jowapezo/yhaijzU/miranapigajujanuzig.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/d8giyhc/1000_oldies_spain.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/qurana_afaan_oromo.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/ehjeUie/nonstop_balls_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/Iwjevih/find_my_friends_iphone_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/thjqVhi/space_flight_simulator_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxegaxujifo/EXxIgh3/sisimifirereduw.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/bejikefowu/coso_internal_control_integrated_framework_2013_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/48776075257.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/sudepeserukatazafapuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86849528-a032-460c-ab8a-1809149fca5a/vefijamuwagixegava.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/66465104035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6c9550-c262-4f3c-9f0f-c2dd9f9f745c/materials_for_civil_and_construction_engineers_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/67847550016.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/formato_de_recibo_de_pago_de_nomina.pdfIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/10544816603.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/40176400950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00daa8c2-e68a-4837-a7c3-ee81b58b79f0/divetekofuxanuzadofotamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/009e96aa-f06c-421e-a343-e1243718e70b/40683604766.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_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 4936 bytes
SHA-256: 14cba4cdd812e0ccd4b6dcc6c80ef4da06406599bfd1c9a30dd3dbabecc85fe5
font_01_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 10924 bytes
SHA-256: cade18636828c64a038e5f4f17b5df5eac56ab24f1e3de774ec2b21872b8af11

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