Malicious PDF — malware analysis report

Static analysis result for SHA-256 4239a1a385ca5caf…

MALICIOUS

PDF

79.3 KB Created: 2021-03-19 22:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1c46fb4a87b7885bf588057e2ee13a63 SHA-1: 5d9eedae837b918ced1544838515f8d1959f6665 SHA-256: 4239a1a385ca5cafe0a78121e1b736009a6aa93480604c0ed432b0fcd952e7ce
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=pandora+mod+apk+download+music PDF link annotation
    • https://cdn.sqhk.co/solalokazili/jjf70ha/wheel_of_time_colors.pdfIn PDF document text
    • https://cdn.sqhk.co/fifibaje/dZhjggw/68605619745.pdfIn PDF document text
    • http://tibisibafub.iblogger.org/muxavegotazexuvol.pdfIn PDF document text
    • http://misozosiviros.22web.org/zunigokefisapofulejanop.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/yichfhg/56902412931.pdfIn PDF document text
    • http://bumalutaf.iblogger.org/51232025810.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/ggghgiU/advertising_jobs_entry_level_london.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_600b78ec8cb3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_5fda857b62ffe.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/zabejuvijolu/damikegemurisikixad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404376aa-7f9a-4e73-bb8a-fb4150c84da8/juegos_de_cinema_2_jugadores_en_equipo.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/12953238083.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/davoduligefumolawuvirupew.pdfIn PDF document text
    • http://dupunijasazo.epizy.com/what_order_is_game_of_thrones_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ea9bc0-2788-4e6e-8665-fb43e9038d2b/rheem_electric_tankless_water_heater_installation_video.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/detailed_information_meaning_synonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9872ab70-44b2-4980-b463-b79506927709/xemokuwatovikila.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_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 5376 bytes
SHA-256: 9690130dafb01fd42c90299ab04070ff715f191631a8a6b492ebe947351a3e84
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 10716 bytes
SHA-256: ba32b9983e1f6187e8d9123b1429348c64e8ba495008581aca2e93af44a9a252

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