Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d5ecf9e7f9611f…

MALICIOUS

PDF

74.8 KB Created: 2021-01-25 09:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 98e4778f5965af339e519a6229d820fe SHA-1: eed711318fe9cd7a481a376f0bcd5290024be278 SHA-256: 26d5ecf9e7f9611f09724d4007017eab48d1baa684d2f83f56debb94303ec5e7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, likely to distribute malicious content or phish users. The document body, though heavily obfuscated, contains references to game-related terms and the authoring application, suggesting a lure.

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://druttle.ru/123?utm_term=los+mejores+juegos+de+guerra+para+android+2019 PDF link annotation
    • http://bu-markett.com/f1_2016_season_standings52934.pdfIn PDF document text
    • https://vuwezamubom.weebly.com/uploads/1/3/0/8/130814902/nuxizurobodosi-miwerowozegebo-waxifan.pdfIn PDF document text
    • http://dihtyar.online/happy_meal_applesrpild.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/fhiiahf/nfl_sunday_ticket_promo_codes_2020.pdfIn PDF document text
    • http://fartook.online/54339237338g4rwr.pdfIn PDF document text
    • http://prazdnikprosto.ru/dafuxubaztxz3q.pdfIn PDF document text
    • https://cdn.sqhk.co/sologavabo/9o1S2ib/36405124603.pdfIn PDF document text
    • http://lifeshop.pro/mortal_kombat_costumes_plus_sizepgmkp.pdfIn PDF document text
    • https://raxugujelagad.weebly.com/uploads/1/3/4/1/134108814/5752132.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/6691498.pdfIn PDF document text
    • https://cdn.sqhk.co/mozopojugode/cicpggV/safari_park_tickets_san_diego.pdfIn PDF document text
    • http://netewe9.xyz/sosikamivosijesaxuvitf5xxf.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/fabitonugalur9mhas.pdfIn PDF document text
    • https://cdn.sqhk.co/vuramufef/jhjePcM/freeform_movies_and_tv_shows.pdfIn PDF document text
    • http://visionnew.xyz/587426616193l66p.pdfIn PDF document text
    • https://wiperorapaxomun.weebly.com/uploads/1/3/5/3/135323561/dibovefejone-budupajugep.pdfIn PDF document text
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/3635580.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/xidulumexi/bekaboo_episode_3.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/fojimodovogegikibiro.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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 5748 bytes
SHA-256: 0beb4de013ca7b6c9bbc9c3700aa0c74c6734de39ff5cf19f458fb1aa2059c6d
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 11300 bytes
SHA-256: 5eb99689998db1c0e6f16a33c039f790cca1db93c95aa59404fe53888e5d8342

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