Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd25f39d47179a9…

MALICIOUS

PDF

76.5 KB Created: 2021-04-07 10:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f8633e1f30ed1e32aa65d988ee7a4784 SHA-1: f9f69a178348eb94f6ca786ec4e446adc5cb71aa SHA-256: 3bd25f39d47179a9a812d49c287a40c79dece1934896cd309f7bed3607d70188
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains a lure related to managerial accounting, directing the user to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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://maypoin.ru/strik?utm_term=all+of+the+following+are+distinguishing+features+of+managerial+accounting+except PDF link annotation
    • https://cdn.sqhk.co/nurijodefa/cnidgMw/zombie_craft_survival_3d_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/aibdzig/21182703096.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/jdnihHW/piano_music_app_ipad.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/zenezazaxak_rekexudeket_kujar.pdfIn PDF document text
    • https://gurovepulebeguj.weebly.com/uploads/1/3/1/1/131163897/7844731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a9b32060-db78-4d39-8eae-078b20c8cf2a/wujimusipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056393a4-6231-416d-add7-1238034d2fa5/17637472667.pdfIn PDF document text
    • http://jutekezas.rf.gd/timepobufipebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8172ba8-2af4-4f7f-9ce9-a983b99ff3b9/62321856794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235adf3e-0463-4db0-973a-19cccdb66559/what_sd_card_for_samsung_tab_a_10.1.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/jojunopazamagorisex.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/bronchopneumonia_x_ray_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800e7cbe-cbde-4f53-8948-a22e5c7884a7/who_was_leader_before_kim_il_sung.pdfIn PDF document text
    • http://terabamof.rf.gd/how_foster_care_system_works.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fe9da2-0049-4a7e-94c9-3c7175cedada/nagodizuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1b9366-d33c-4d4d-9adf-2a93b331f52c/jack_lalanne_power_juicer_express_price.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 5600 bytes
SHA-256: 10823412a7154d7ca08f8756bc5b09aec745e6c7c60c210330c4f6a7e80c5cc1
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 11224 bytes
SHA-256: 63847b2f3009b3404c08cd2724b7e55e1135c97eb5f89586bf13f255b1d48444
font_02_sfnt_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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