Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea31e375e212b340…

MALICIOUS

PDF

83.9 KB Created: 2021-03-28 02:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e6dbb614fc3154e77a4e2efca4c693b2 SHA-1: 0faad0f9e6b96376d9135e70dcdc82b92e33765e SHA-256: ea31e375e212b3404f6bc142c09afff79002ed7c65b86f9c5469531d349091b2
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=calidad+de+servicio+definicion+pdf PDF link annotation
    • https://cdn.sqhk.co/gudijupimeb/ewgiPHQ/88313375666.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/dpDjhdM/84034270320.pdfIn PDF document text
    • http://siteznakomstv69.space/how_to_start_exercising_at_a_gymhc28c.pdfIn PDF document text
    • http://timecodes.net/nidegemb3jiz.pdfIn PDF document text
    • https://cdn.sqhk.co/rizakumer/ikKjegf/arena_shooter_crazy_games.pdfIn PDF document text
    • http://ketotreno.buzz/raymarine_c120_size9zov9.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/aGvygcG/furreal_friends_starlily_my_magical_unicorn_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/Vgfvigj/business_process_management_software_open_source.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/hdjbYnD/wozuwekuxibubewetulexil.pdfIn PDF document text
    • http://dnepr24.info/short_stories_in_english_for_students_with_pictures8s0f2.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/gNlhbic/pegufupetonarobugorima.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/GifgisW/prius_red_triangle_warning_light_vsc.pdfIn PDF document text
    • http://tublitalia.fun/93763999588y1g23.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/iejirxy/40874902993.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/58ac9e78-0564-433b-80ad-3e621ad2cea7/tilexiramav.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/nazamukomen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32f6b8e-d6af-497a-aa28-3f629cd5ef94/kawasaki_fh580v_carburetor_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893ca3f9-02af-4672-87ae-60b8c5c29003/31421750680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/388199d2-a304-4e76-a259-81219ad20cd6/63501131780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677c5776-aa8f-4a90-8584-916ff8f947ee/jafosadakikitixanenij.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/kujugifiridireli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec6f94a-0a15-456d-b79f-b0c3351708c2/zaxeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7bd14ac-1681-4428-af97-83fd44498e6f/povarodewusitijidaxufotan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a518bf6-32a1-4cdd-ba64-1546ab431bb5/excel_vba_range_value_vs_value2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc11b076-514e-466e-9363-5931d468f895/celestial_warlock_5e_spell_list.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_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 5116 bytes
SHA-256: 724c59e4192166a51509c256d669c94bece6922dd6239f402d7845d749110f49
font_01_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 11408 bytes
SHA-256: 338000dcc539be0e2ab5252cc8f989990196d65599095e03f6d5b79d57d4edfd