Malicious PDF — malware analysis report

Static analysis result for SHA-256 5521ff33952c3909…

MALICIOUS

PDF

78.8 KB Created: 2021-03-17 19:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fefb1caddafe1bd913d5463ff16c226d SHA-1: 652f05e363d8cb65c0d4da616dfef1b46abf7889 SHA-256: 5521ff33952c390901844c18a4236fcf66899b30cc30f350c7edbbc5a7ef935b
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'https://jumiwimov.ru/wix?keyword=goldstar+microwave+convection+oven+manual', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URL is the primary driver for the attack pattern.

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://jumiwimov.ru/wix?keyword=goldstar+microwave+convection+oven+manual
    • https://cdn.sqhk.co/fumodolanes/jecTkia/2229668425.pdf
    • https://cdn.sqhk.co/gepabafi/g4igThg/wisodetumojedo.pdf
    • https://cdn.sqhk.co/lukumuzu/gdLFrA7/most_viral_tiktok_video_2019.pdf
    • https://cdn.sqhk.co/vowibesep/hjjtVKG/hartan_racer_skater.pdf
    • https://cdn.sqhk.co/jizuxadif/ij5yhjJ/61812515.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d1b62ac4-4bbe-4ddc-82a4-e994c1485cf5/what_grade_level_is_dork_diaries_series.pdf
    • http://dutinafojev.epizy.com/derisunapasurofewuzof.pdf
    • http://puxetedategekex.epizy.com/bernardo_guimares_o_seminarista.pdf
    • http://babudenipovux.rf.gd/archiving_system.pdf
    • https://uploads.strikinglycdn.com/files/0b157f0e-5682-4ae8-9234-8699b143cb97/10954247923.pdf
    • https://uploads.strikinglycdn.com/files/8f5312af-6de1-4fbd-b14e-ead7e170b137/93564246891.pdf
    • https://uploads.strikinglycdn.com/files/6dbde045-3b6b-43d6-8ec0-f6b28ce52457/harbrace_college_handbook_wikipedia.pdf
    • https://uploads.strikinglycdn.com/files/8c5cbeea-ee55-4056-9851-e9b29a9a8478/public_speaking_topics_for_college_students.pdf
    • https://uploads.strikinglycdn.com/files/b301783b-2272-4073-a210-487020598963/45079815595.pdf
    • https://uploads.strikinglycdn.com/files/1ed1ef25-4da8-43c1-9a20-c23941e94b00/ccmsetup_failed_with_error_code_0x80072ee5.pdf
    • https://uploads.strikinglycdn.com/files/9abe79d7-3c86-4266-b04d-7cac043e8213/calligraphy_exercise_sheets.pdf
    • https://uploads.strikinglycdn.com/files/bf174dd4-babc-4b5e-adab-96bbdc884fd0/what_does_public_speaking_anxiety_mean.pdf
    • https://s3.amazonaws.com/dusubonifu/localizar_mi_movil_android_con_google.pdf
    • https://s3.amazonaws.com/fodose/income_statement_and_balance_sheet.pdf
    • https://uploads.strikinglycdn.com/files/7c071e94-91a6-4a5e-8f40-b0849686d2bd/jolidapobosixatuvoxan.pdf
    • https://uploads.strikinglycdn.com/files/0ea4ec24-8716-4d4c-9b48-c242552b48b5/can_i_use_my_own_car_seat_with_uber.pdf
    • https://uploads.strikinglycdn.com/files/002d154e-02e8-446f-9fb8-8a0c0e155979/boss_lady_means.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_off0000f5eb.bin
25e65626b4be20f29d86b54051a9484a84627119aa6b4d23c434c14356c2ceb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 5268 bytes
font_01_sfnt_off000107d6.bin
ca02537691fc28a302ed4515a608aa9eeac49925dfa936244a2c7af83bb4970f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 11652 bytes

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