Malicious PDF — malware analysis report

Static analysis result for SHA-256 54537bf2b43f1b74…

MALICIOUS

PDF

67.9 KB Created: 2021-03-13 22:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3b77c1b6b1cf6836abd729b3bd7d9162 SHA-1: 58952acf81ff7800dd874226b2ab1421b7689588 SHA-256: 54537bf2b43f1b7465567702ab9b90f0b8f8b6d0500ae5088e825a919f97a4a3
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains an embedded URI pointing to 'https://jottigo.ru/wix?keyword=oaks+portal+students', which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, contains text fragments suggesting a student portal lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=oaks+portal+students PDF link annotation
    • https://cdn.sqhk.co/xoripudesew/jhN8JyQ/weekend_update_sat_night_live.pdfIn PDF document text
    • http://tinuliv.22web.org/classroom_application.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/gfkjcOr/line_color_3d_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/RPMghOk/ski_barn_rentals_wintergreen.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/bjeONuF/68662687965.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/idgeijh/8536851226.pdfIn PDF document text
    • https://cdn.sqhk.co/wemowubire/y5hbUD3/powodarovokelidepidaf.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/gcwAdjj/fevumufaxesajaw.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/WibejcV/hungry_shark_heroes_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/OgiiUXQ/management_consulting_firms_nyc.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/be1ccd17-856d-4862-991a-f5778e1775b9/59122565665.pdfIn PDF document text
    • http://kubuxakul.epizy.com/latest_chrome_browser_for_pc_free.pdfIn PDF document text
    • http://xanunomoz.rf.gd/breeam_international_new_construction_manual.pdfIn PDF document text
    • http://witeguxatuzidaj.epizy.com/83445327388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ffcdc0-4ec9-4fe8-95ba-b0f6544d9474/bally_electromechanical_slot_machine_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62428502-406e-45ad-91be-6c9f0c775373/favulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13ff12d-407c-4c18-a157-9b13444084ec/how_to_remove_a_salt_chlorinator_cell.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_off0000c25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25A 4876 bytes
SHA-256: 68afb3f81e5494fba6f6eed37814eb17e950f6ad3e67dbc0e5f7c6cc2c4dadce
font_01_sfnt_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 9856 bytes
SHA-256: e9e1d549d6c70be7b481b71d4c47817d854c2ef43f4c96fe230d995df96b9f91
font_02_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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