Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0088959a02e8cd9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 11:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06e88dde190fb27828cb60ec42b48850 SHA-1: 25fbc7799f2e4c760d8170a46e5e03246d06e125 SHA-256: c0088959a02e8cd933fe57fa6cbaf3418d2bce825d39705ee61f2acc3bd0725c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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 http://challendor.com/fckeditor/upload/file/fukepem.pdf
    • http://bangdientunhk.com/upload/files/musagigodoxob.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363c7dd09b7.pdf
    • https://prospr.fr/ckfinder/userfiles/files/15894945522.pdf
    • https://turkuazhost.com/calisma2/files/uploads/nezadawunijakoto.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613638c27ebcb---jerefamanematakogixezepi.pdf
    • http://studioarchterreni.it/userfiles/files/16817482808.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/38233468673.pdf
    • https://sangolongphuong.vn/longphuong/news/files/52840119829.pdf
    • http://keralastatetailorsassociation.com/userfiles/file/gobiranotinebolim.pdf
    • http://thepducphat.com/upload/files/98659438674.pdf
    • http://designgaleria.hu/userfiles/file/21969816906.pdf
    • https://szekszardportal.hu/userfiles/file/valimuvenopexuka.pdf
    • http://reklamavysocina.cz/UserFiles/File/13464695534.pdf
    • http://hingliltd.com/userfiles/49272021340.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0944e66nm5ocn6gdh30nupsh67/42022588459.pdf
    • http://jyczgj.com/UploadFiles/file///2021090612510545.pdf
    • http://gwtcs.org/Content/uploads/files/figap.pdf
    • http://www.anaja-inter.org/public/file/rudosorizer.pdf
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87935519085.pdf
    • https://shevian.com/images/file/wosowipabevumipenib.pdf
    • http://villkasz.hu/editor_up/5043684990.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/mudule.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+robux+online
    • 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_off0000e140.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 16792 bytes
font_01_sfnt_off0000f952.bin
5ab4e4c021734ff9ff52ac582191509e9816aa9a05aaa45b549deb23fd9d0779		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 19004 bytes
font_02_sfnt_off00012acb.bin
8139cd4bea98bd9b22f5737a372bf4b4dfe3076213dc697d55d0b9e7f299f67f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 9992 bytes

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