Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d96a5aa2d2e956…

MALICIOUS

PDF

90.2 KB Created: 2021-06-04 20:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f310331d7f9e28e9356910198b01db24 SHA-1: 76181c064299649e1543f1e99fc553b980934e21 SHA-256: 19d96a5aa2d2e9564d1bd7283f117996a114d3c463f09a82f632cc20eff2dc69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content or for SEO manipulation. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely a phishing or trojan distribution attempt. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=blizzard+warcraft+3+frozen+throne+patch
    • https://moginirem.weebly.com/uploads/1/3/4/7/134769545/9058a6477e.pdf
    • https://cdn-cms.f-static.net/uploads/4477138/normal_601a70481f1c3.pdf
    • https://muzunamarufo.weebly.com/uploads/1/3/4/4/134463020/kogazegegob-fabokagezoduv-jafunabunapeze-muzatosata.pdf
    • https://vawavujak.weebly.com/uploads/1/3/4/3/134350312/3594248950.pdf
    • https://zemokozovoxepuj.weebly.com/uploads/1/3/0/7/130776726/cd34d7a580856.pdf
    • https://cdn-cms.f-static.net/uploads/4475859/normal_60546cce59b63.pdf
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/1538802.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a57e2762-af05-4750-a6a6-a306ca8462de/how_much_do_mechanical_engineers_make_in_usa.pdf
    • http://povelin.pbworks.com/f/bushnell_tour_v4_patriot_pack_laser_rangefinder_manual.pdf
    • https://uploads.strikinglycdn.com/files/d651daa4-2de0-4eeb-a7f4-905af96ba334/xalile.pdf
    • https://uploads.strikinglycdn.com/files/6b94de2c-33d7-4539-8432-a72dff92b528/windows_10_installation_failed_in_the_safe_os_phase_migrate_data.pdf
    • http://pewudomame.pbworks.com/w/file/fetch/144615750/free_fortnite_accounts_email_and_password_ps4_2021.pdf
    • https://uploads.strikinglycdn.com/files/65d65e10-6cd2-4d59-87fb-6178f261fdfd/sozebuwisavunogi.pdf
    • https://uploads.strikinglycdn.com/files/04fdf382-f0d6-4dd8-9ff5-d7cf976d4dbd/how_gamification_can_improve_hr_management.pdf
    • https://uploads.strikinglycdn.com/files/5fa77846-4476-40e7-aaf9-d2d1dac393ae/clarion_car_audio_bluetooth_how_to_connect.pdf
    • https://uploads.strikinglycdn.com/files/68865711-e894-4bc4-a476-0adfc1268db9/73900975191.pdf
    • https://uploads.strikinglycdn.com/files/3cbcca51-3ab3-4ef0-ba0f-96e10c289563/how_to_calculate_uncertainty_of_measurement_in_excel.pdf
    • https://uploads.strikinglycdn.com/files/a9305316-ba7a-432b-b9f5-e6e3c55c94eb/beragazimisosuwolegep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012213.bin
ccae9107f43e5f299981961841152add44179c5b1208f547fddf3ab52a6a205f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 5420 bytes
font_01_sfnt_off0001349d.bin
06544dbd619ac01d453f3949ea864507e12a7d2d3785d118895ed044c03ed24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 11276 bytes

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