Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb3c10459764173…

MALICIOUS

PDF

80.1 KB Created: 2021-03-13 17:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ef68379fb88dcb706a4d0f8825091df3 SHA-1: a145180acf4237edd3a198bfabcb113850b92f28 SHA-256: dfb3c10459764173de239cfe8235c7dfd892476a4de4f2bd3e9f3c88daccd0f7
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded URL pointing to 'kuzutuzo.ru', which is likely used for phishing or to download a secondary payload. The document body, though partially corrupted, suggests a lure related to career summaries.

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=getting+from+college+to+career+summary PDF link annotation
    • http://silekutum.medianewsonline.com/gexederapoxisik.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/xofamonedugenebu.pdfIn PDF document text
    • http://mebotus.mypressonline.com/miller_trailblazer_302_for_sale_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/rapenikidu/gfju0hg/bollywood_top_100_songs_2018_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/Xpghdha/gubeforinesolefizigu.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/71372569302.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/cvjeigV/wuruxixiroka.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/rubidokezive/sundance_spa_dealer_nh.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/xaveserabuzurukid.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/android_okhttp_post_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2dfddb8-9d42-4406-a954-610efef4cae2/vokekakokazagirosagari.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/formulas_de_areas_e_volumes_de_figuras_geometricas.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/25265701994.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/87459130795.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/work_plan_timeline_powerpoint_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb48258-04e1-47df-8e42-3551509b8559/sharp_microwave_parts_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/mibukoja.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/peoplesoft_fscm_functional_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/36084013026.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_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 5332 bytes
SHA-256: 886059b39f049e08b3c48ccf9edc1bef6ddb6302a14be712ad1a8f1426693f1a
font_01_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 11388 bytes
SHA-256: 5d971ad56d87f927c5e87e0e7581f25d57aac06e2731ed12ea3ffd6456a5a8fe

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