Malicious PDF — malware analysis report

Static analysis result for SHA-256 7366634ae1a1e477…

MALICIOUS

PDF

120.4 KB Created: 2021-04-01 00:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5fdb58574f77d54fcfe53e91d0197d07 SHA-1: 56b54209a138fc8492c8cd22754eefe16724f1c8 SHA-256: 7366634ae1a1e47704bdd5d7a1dd18b1e0d7eba079a6507f78b4b63938317383
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate social engineering attempts to bypass security by instructing the user to disable antivirus and execute commands, consistent with ClickFix attacks. An external URI was also identified, suggesting a potential download or redirection point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=adobe+creative+cloud+direct++helpx PDF link annotation
    • https://cdn.sqhk.co/xotosobupis/aOidAhf/emergency_vet_cost_assistance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_602729c4eb5d6.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/1jjKlfV/warship_legend_idle_rpg_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuzodopuvu/cWAhbOw/emergency_ringtones_free_download_telugu_devotional.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/jfgexja/warpath_jurassic_park_t_rex.pdfIn PDF document text
    • http://jesibijifinuz.mywebcommunity.org/algorithm_design_and_analysis_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_6027bedeac53a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421205/normal_60613a2840468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5fd938be28ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_600db522816af.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/26534246061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/567c1cb2-af43-4c2b-b92c-d42165214710/prayer_of_jabez_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f3744e-29d1-43e8-b723-6a61c7102a97/los_ros_de_color_prpura_pelcula_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fda1dca-ef44-443b-9ba6-a7a1768d30bc/swann_wireless_security_camera_system_setup.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/60961037216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e551e52-5ae3-49b1-b322-d7a0484de843/70523549305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35fa32af-e965-4cf9-85fe-bcb132573380/gulajiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98657a7d-6d31-4355-847b-c6d4b759ebee/diwukapokugusujadagat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7189feb-9424-4da1-9d03-2b264913a701/doorking_1810_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74466aa-f9e7-483d-848c-4d64fceb6317/27180403652.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_off00019ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CA9 5240 bytes
SHA-256: d1cc23e677d610ba33c05cb7db9a1263f51c725c32d346e7fcc84df6d6f8db6f
font_01_sfnt_off0001ae77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE77 10964 bytes
SHA-256: 27ec5ca2cc4681d3015e69c82285d41d75308747d9f53a87ee9c714bfe50906c