Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92bd631f482811c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 02:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0329c6b6daf0e3a4ff824152a10e3693 SHA-1: 964b66ef5e848617c1e6ce3867f815933013550d SHA-256: b92bd631f482811c661182f98f674874b9398beb986dbafef8c2094f396e4015
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://laborke.ru/uplcv?utm_term=loco+free+live+stream+apk
    • https://corpeverest.com/ckfinder/userfiles/files/93751338072.pdf
    • http://studiogaleazzo.eu/userfiles/files/lojurote.pdf
    • https://beautydent.hu/editor_up/80732692389.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/migozupe.pdf
    • https://lecourbe.dk/userfiles/file/wujapupaf.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9ef459dd---rimomoz.pdf
    • http://grupophi.es/uploads/files/31942724881.pdf
    • https://csmgh.net/pevron/www/img/file/76502063743.pdf
    • https://tybistanbul.org/resimler/files/vunalopamewu.pdf
    • https://buonoantonio.it/userfiles/file/85331077665.pdf
    • http://casaledellasignora.it/userfiles/files/16922599289.pdf
    • http://mastervgtour.by/var/upload/file/sedirepawixozufesifemev.pdf
    • http://africareview.in/userfiles/file/9091531917.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/sadaxokirijabunetarufu.pdf
    • https://qualitygums.com/userfiles/file/94893621868.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/4470155885.pdf
    • https://activepymes.com/pub/file/sizitubivirusugo.pdf
    • http://weighlessthisyear.com/ckfinder/userfiles/files/bevuguzekotamebu.pdf
    • https://houstoncoinclub.org/FCKeditor/file/rajumazemowadosa.pdf
    • http://katela.net/userData/board/file/21215354517.pdf
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/8083794507.pdf
    • http://minhledtran.com/luutru/files/27057783409.pdf
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/muwabavesor.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/88378596005.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_off0000df00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 16792 bytes
font_01_sfnt_off0000f717.bin
fb394d2c64a3d6b91c867a91d8d40caa410ae3c65778e83d2b6acafd52f8db6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 10652 bytes
font_02_sfnt_off00010f8d.bin
2e50c54110f25cc6a03fd801da04687308a934acacc5872261eb1cc3c289cca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 17476 bytes

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