Malicious PDF — malware analysis report

Static analysis result for SHA-256 907cfde0d22f9947…

MALICIOUS

PDF

86.7 KB Created: 2021-03-07 22:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0a5c0b8f4cb77852a1b317d50e6b4a0d SHA-1: f84fe4397a2e7883383f9736d28c88fa385c2a90 SHA-256: 907cfde0d22f99479964e819ea97e75a1e9df628cdf91839ecc74688b1052bc5
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, 'seumenha.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated by a tool rather than being a standard document. No scripts were extracted, but the presence of external URLs and the overall detection profile strongly indicate a malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=five+nights+at+freddy%2527s+explained+game+theory PDF link annotation
    • http://cocobeautybar.ca/vitalina_wilson_fresno_ca0bzfx.pdfIn PDF document text
    • http://startbastar.online/yin_yoga_poses_sequencedw2o5.pdfIn PDF document text
    • http://stavki-na-sport.site/802095260308pt1u.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/daniwodug/calculating_molarity_practice_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/android_studio_closing_emulator_freezes_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/bewexud.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/how_does_a_shark_protect_itself.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/gangster_games_phoneky.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/animation_video_editing_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/commands_in_linux_terminal.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/hogwarts_acceptance_letter_template_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/75182062680.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/lodizaxer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eab45fa-7ac6-49f2-88dc-13cd0344ee88/the_pyramid_principle_barbara_minto_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/5606259300.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/android_change_default_screenshot_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d26ad7-50cb-41ad-a259-9359edd7218f/ms_drivers_license_office_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/accounts_excel_template_small_business.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/21340308105.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/buffed_wow_classic_jger_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b470ce-b8c4-42b1-94da-3971e2cf9c38/historia_natural_dela_enfermedad_periodos_y_niveles_de_prevencion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804972ba-3830-4c64-964b-c364011cbb6a/wagiwesudinekudema.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/dominant_and_recessive_traits_worksheet_5th_grade.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_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 5676 bytes
SHA-256: 65a5013a338a7e9242de3313370453ea7e0c5dae845b91b03f4099649ca79a34
font_01_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 11208 bytes
SHA-256: 13a28d589ae9880886e97a3edb87069ffd19d4c7534f3c86784bc25bf9dc4bde

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