PDF malware analysis — malicious · cf730648ad4aaba3

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 06:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9c35ecc86d393a3ba91406d196ac0460 SHA-1: 331b5109df8cd902f740b0a7529218bf01c0c9cb SHA-256: cf730648ad4aaba3b2084e3a3d08264579584a020eba7f1d7e741d264466377b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://twilaw.com/files/files/kupusa.pdf In PDF document text
- https://electroagro.es/pub/files/zutidusizili.pdfIn PDF document text
- http://didopack.com/files/61451068700.pdfIn PDF document text
- http://guowangcable.com/d/files/nupaxivupasagubav.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4b6eb408---82884540306.pdfIn PDF document text
- https://myparrotfood.com/user_files/files/toponekugor.pdfIn PDF document text
- https://inprovitcaribe.com/ckfinder/userfiles/files/46805059261.pdfIn PDF document text
- http://starfishdowney.com/uploads/files/fuvobazel.pdfIn PDF document text
- http://nhagiatxanh.com/public/default/ckeditor/files/zewototuwato.pdfIn PDF document text
- http://milkexim.ru/imgeditor/file/balojixapifegusolarizax.pdfIn PDF document text
- http://pc580.cn/upload_fck/file/2021-9-2/20210902044844106997.pdfIn PDF document text
- http://khmim.com/ckfinder/userfiles/files/72928607103.pdfIn PDF document text
- https://hockeymro.ca/docs/file/bamowiwibekudu.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6a555d307bf707ce069117a04f3cf94a/49465339902.pdfIn PDF document text
- https://agroadvanced.com/app/webroot/newsletters/editor/files/71769800844.pdfIn PDF document text
- http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/monafunup.pdfIn PDF document text
- https://eurouniversal.eu/ckfinder/userfiles/files/lefejogoxero.pdfIn PDF document text
- https://franchisefarm.franchiseharbor.com/files/files/maluzukitukokopil.pdfIn PDF document text
- https://peltonfell.org.uk/ckfinder/userfiles/files/fevexuzoxutabolira.pdfIn PDF document text
- http://mt-filtration.com/uploaded/file/21211972366139dcf779828.pdfIn PDF document text
- https://truonggiangcompany.com/userfiles/file/kofojojosa.pdfIn PDF document text
- http://bielle-srl.com/userfiles/files/vetereboki.pdfIn PDF document text
- http://eco-versute.com/app/webroot/ckfinder/userfiles/files/nitogupazuzomuwewufodagip.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=business+communication+concepts+cases+and+applications+pdfPDF link annotation
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bbfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBFD	15680 bytes
SHA-256: `99222ee1e4d8bc01b5a148787ed1b3d2c6bb6204074bfabf821ab2ed985a5744`
`font_01_sfnt_off0000e409.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE409	10832 bytes
SHA-256: `0d3e09585a1f8f1741bc7e7ebfaac3b0f28f89e0972e790b7d4cca4edf2bcc06`
`font_02_sfnt_off0000fd11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD11	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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