Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade86290cc540fb4…

MALICIOUS

PDF

68.9 KB Created: 2021-09-18 23:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a23d949fc95db79ff3bb4d1c1bc7f81 SHA-1: 401c007e8e0f246069dbbf1980dbde94dd7c43a5 SHA-256: ade86290cc540fb44270454da4979848dcd419368cbb47ed6670518e169a14cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, suggesting it is designed to redirect users to potentially malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=big+head+football+friv
    • http://www.childofafrica.org/media/userfiles/file/xunuromasi.pdf
    • https://trvstore.com/userfiles/file/dafamuwukaxoj.pdf
    • https://eastmangroup.org/ckfinder/userfiles/files/75591250148.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/65852585978.pdf
    • https://polenhosting.com/calisma2/files/uploads/motekusazemewupalo.pdf
    • http://hourinkan.net/js/upload/files/50623388675.pdf
    • http://zhongyuemedia.com/filespath/files/20210905013408.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24a9a5270---91438954426.pdf
    • http://fizjoactiv.eu/Upload/file/pupogubomogoso.pdf
    • http://meditopthailand.com/file/89376120185.pdf
    • http://bagliodeimille.it/userfiles/files/89841412710.pdf
    • http://parilka.by/var/upload/file/fominupasajojinabidugu.pdf
    • http://wildpflanzen-planung.de/file/nerasusin.pdf
    • https://htijsr.com/userfiles/file/selurogo.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69b98b990---71689766313.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-14/20210914151739843175.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/zebib.pdf
    • http://jamalcar.com/userfiles/file/bejaxuxizotafa.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/9845046059.pdf
    • http://xn--tnqz8hz5cb8l.com/upload/files/vinig.pdf
    • http://insightonafrica.in/userfiles/file/dukobudanizo.pdf
    • http://gorisum.net/fckeditor/upload_file/file/zinawa.pdf
    • http://talleresjpg.es/img/file/63304336714.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b026.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB026 16792 bytes
font_01_sfnt_off0000c83d.bin
d35336d942696abde70bbca84ef57c761b38ca5c36e88c0162ac7b775d3b8f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC83D 10620 bytes
font_02_sfnt_off0000e070.bin
6241ae0e100c5e24e58fb1a3452e7b9b1c72a1ee6295345e034534c90a0fbb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 15108 bytes

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