Malicious PDF — malware analysis report

Static analysis result for SHA-256 950b64c7d9cfece0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 13:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e1c9af0a62edcfb299480951b3f9cf6 SHA-1: 0e69dacd925423ed252a5f117142dc5e5d887a83 SHA-256: 950b64c7d9cfece0307d528b18994b5d17f92ce9c4143b61d7862462fb583616
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=torrent+movie+download+sites+for+android PDF link annotation
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374baac141a---fujezulusukaro.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/zaxarodireweleromujazilo.pdfIn PDF document text
    • https://rippa.pt/files/file/71648012218.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210903000239_24520735.pdfIn PDF document text
    • http://boki.hu/editor_up/70379831868.pdfIn PDF document text
    • https://sinarwaja.com/account/files/gusajadekaxozizedo.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/tigurirojabojolesej.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/neduwulunejepodudiro.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/56217000710.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/gowazaduretipimotixupi.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/vageretipifusajug.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/zekariro.pdfIn PDF document text
    • https://wineart.online/userfiles/file/81971103212.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/ropux.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/geladiterixedelowor.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/jewavikedukexanomekorava.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/917365669.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/54704727432.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/66404647127.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/fiwamiteromutis.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/84205183322.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/26510482060.pdfIn PDF document text
    • http://ingore.cn/upload/files/bimabitamige.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 17164 bytes
SHA-256: ed0670eea81d51a17c3e175b6ee60db78c482efb350aaa5bc5278865cbe4fe64
font_02_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 10628 bytes
SHA-256: 5226560dffe71481dc8943add98fa4c3a58832a71fd183b154e91814a474ae32

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