Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c36bf2b7493ebf…

MALICIOUS

PDF

78.1 KB Created: 2021-03-05 07:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9c3213325404ee9f07b0d11938490b83 SHA-1: 79c767943f4556e3e3a3b836ff583172889bfa8f SHA-256: 06c36bf2b7493ebf969b1e400de39e9b76f80fa77961a09f1e7b5a886f8801df
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination or purpose through multiple redirects and link farms. No scripts were extracted, but the presence of external links and the overall heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/123?utm_term=cuantos+dias+feriados+hay+en+estados+unidos PDF link annotation
    • https://cdn.sqhk.co/sidigodoga/Mhi9QSz/pok_evolution_clicker_planet_idle_merge_games.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/jaUjcmA/death_breath_bandcamp.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/rMjf1ib/17074519081.pdfIn PDF document text
    • http://limavirom.22web.org/bolaruviwadokaf.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/buduzuzhbqlc.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/jhjihib/rescue_wings_malta.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/jfghgcL/car_lease_buyout_calculator_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/ijciiam/14150019695.pdfIn PDF document text
    • https://cdn.sqhk.co/bukulavor/lHVggha/49097640033.pdfIn PDF document text
    • http://vokukaguvez.iblogger.org/adam_interactive_physiology.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/S5ZheSa/angry_birds_2_soundtrack_list.pdfIn PDF document text
    • http://4338bacchus.com/how_to_scan_for_stocks_to_day_trade_thinkorswim3q1m7.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/J0L66ig/3140586093.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/PjhiayY/23185535064.pdfIn PDF document text
    • http://mubokugezop.22web.org/what_to_say_when_he_comes_back_after_disappearing.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/90568c18-11d6-4d83-875e-b52dd3e0ac00/69789718481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84cb3d9-e49c-43c4-9e9a-15fe4844b975/ejercicios_de_comprension_lectora_para_primer_grado-primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634b3fb5-4206-42dc-84f8-5a8ac7c62dc1/entry_level_technical_writing_jobs_from_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156e7bfa-ccb6-400c-b892-26fdba528029/10308810518.pdfIn PDF document text
    • http://ravawubiralimiw.rf.gd/widerokezoxofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88fca2d-f3d8-4945-bdbd-d19731cc7107/zoom_g11_price_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed4b64b-b885-47b7-9bc6-5a26790aafa2/40986146154.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_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 4972 bytes
SHA-256: df5aaa03ffc893bf98ff8fcee28c0dfeb61ebc6103e34cd7e1a82e3c7745f015
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 12092 bytes
SHA-256: 768cdc1d8b9982909ee8a3e104eb73cf79467749f249471333db995e0c526a9b

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