Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8439d9852e80cc…

MALICIOUS

PDF

107.2 KB Created: 2021-04-06 01:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ba570b06567fb0e8f69d11a7abbf5f SHA-1: d16081afc40bedb8aca8924171ef8567794be40d SHA-256: 9b8439d9852e80cc9ec1b6d832c5fb4cccdecf3d03d0c019f6544a66be517656
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier 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. The document body, though heavily obfuscated, appears to contain text related to product comparisons, suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=compare+roomba+960+and+i3
    • http://foramodosug.mygamesonline.org/advantages_and_disadvantages_of_green_technology.pdf
    • http://mekapidi.medianewsonline.com/ataxia_exercises.pdf
    • http://texewofe.22web.org/pt_bd_sharma_university_date_sheet_2018.pdf
    • https://cdn-cms.f-static.net/uploads/4452834/normal_60494eaae9536.pdf
    • https://cdn-cms.f-static.net/uploads/4461245/normal_60334424ac51d.pdf
    • https://cdn-cms.f-static.net/uploads/4424029/normal_6063abba68469.pdf
    • https://cdn-cms.f-static.net/uploads/4422876/normal_60665eb136601.pdf
    • https://static.s123-cdn-static.com/uploads/4453332/normal_5ff2d6d3a052f.pdf
    • http://joweponula.mywebcommunity.org/66956781131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nafoxuda/ashcroft_technology_academy_ofsted_report.pdf
    • https://s3.amazonaws.com/bufexa/sosilip.pdf
    • https://s3.amazonaws.com/nowokil/website_header_design_templates_free.pdf
    • http://sibazod.epizy.com/section_1_chemistry_of_life_worksheet_answers.pdf
    • https://s3.amazonaws.com/levovod/55464921942.pdf
    • https://uploads.strikinglycdn.com/files/81f15bd6-c3a8-4eb9-a9a9-7f173747dfc2/29658979806.pdf
    • http://vedisupekak.epizy.com/so_you_want_to_write_a_fugue_midi.pdf
    • https://s3.amazonaws.com/davolazupivowi/76760791339.pdf
    • http://tasopawak.rf.gd/tecnologias_de_la_informacion_daniel_cohen.pdf
    • https://uploads.strikinglycdn.com/files/29743a56-8837-4ab8-b0b0-0198f4167686/tuck_everlasting_figurative_language_worksheet.pdf
    • https://s3.amazonaws.com/mefadedosuw/editable_html_email_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c12.bin
9ae44c4eb1cc8b5754e703fc65db6e69bbdd1a9ef3cf4472ec67f3a54bc9e8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C12 5556 bytes
font_01_sfnt_off00016ebb.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EBB 1800 bytes
font_02_sfnt_off00017749.bin
9acd2c79bdeeaaad4112534ecacc8a19059fd74289805c14054de344fe46c160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17749 11348 bytes

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