Malicious PDF — malware analysis report

Static analysis result for SHA-256 6642fab87a8aad64…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 16:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47e2e0752696313c709439f158ea7373 SHA-1: 655b985475c27bc2cc81b0f87ecdc63e1d5e57b8 SHA-256: 6642fab87a8aad6409c2c7e5db0ef87b01c6b965d9a6a22d5d4a5de2b04ba7f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a high number of external URIs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://hmondo.com/userData/board/file/kawexubu.pdf
    • https://kibledergisi.net/resimler/files/bekunawikafovejinuze.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/ludoradowenetesifapada.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2a61ecf83d14883cb04c023c2d390ec4/komenuxigazak.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/buzobawesirigomexutiwesit.pdf
    • http://condominiobrisasdelnorte.com/userfiles/file/1991108168.pdf
    • https://rmp-traueranzeigen.de/cms/files/57838342757.pdf
    • http://wwm-quanta.com/upload/files/5709569845.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/98737534529.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/fegojibuvezejunezaz.pdf
    • https://vocembalo.ch/userfiles/file/63533798630.pdf
    • https://hoanghaie.com/Images_upload/files/kujebi.pdf
    • http://farmaciafici.com/userfiles/files/65812493731.pdf
    • http://hoadon-dientu.net/images/files/tirukezamawafan.pdf
    • http://verkaufs-akademie.com/userfiles/file/35316840804.pdf
    • https://www.alugutader.fr/ckfinder/userfiles/files/rejakikepitik.pdf
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210911004712.pdf
    • https://zagorjeadventureteam.hr/files/3741953543.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/vukepadujewewavukevilopaj.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/16014fd960330d6c842ee8f2734433f1/54082786708.pdf
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/34673512467.pdf
    • http://dichvumucin.com/upload/ckupload/files/36365955144.pdf
    • https://underworldgear.com/upload/users/files/15085536388.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=stick+cricket+mod+apk
    • 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_off0000d5c7.bin
513873baec0529c8f341e47b88b0e3ef77c12f2b3a7ca91c3e58ba1e9e1a4576		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 17208 bytes
font_01_sfnt_off00010227.bin
b07348f55de7ac35311f58fa7744c0dc472dcc37b179cd3fbe74c8ca2c5d0db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 10524 bytes
font_02_sfnt_off00011a28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16792 bytes

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