PDF malware analysis — malicious · 799f7918de66b404

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 17:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 68ce3ab1e06d4ff723a8e15ecb3303e9 SHA-1: f9cf15f559ce8d8078421df1f0c41e8c2375b64e SHA-256: 799f7918de66b40403e4e4c3df30901c9dbd8b5a629eae0012cef0e36bd2dd52

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristics indicate it's part of a link farm, with many distinct hosts and disposable URLs, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://rajaunited.com/contents/files/dolufopit.pdf In PDF document text
- https://luiginoiobbi.com/userfiles/file/82225485860.pdfIn PDF document text
- https://wietsevoermans.nl/ckfinder/userfiles/files/bazik.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/14609545418.pdfIn PDF document text
- http://bachtungcompany.com/upload/files/kulakulatisabijefaroxegi.pdfIn PDF document text
- http://climtech.com/files/files/zozonuvotesizepuximem.pdfIn PDF document text
- http://coolscape.info/images/files/13479195342.pdfIn PDF document text
- http://sobinco.cz/ckfinder/userfiles/files/vixevunopovoxa.pdfIn PDF document text
- http://nerezove-kuchyne.cz/UserFiles/File/80899031716.pdfIn PDF document text
- https://zivotzaokny.eu/res/file/nomidotopifux.pdfIn PDF document text
- http://aedelsur.com/contenido/files/36593626534.pdfIn PDF document text
- https://qigoodteam.com/uploads/files/202109021732243062.pdfIn PDF document text
- https://segurodegranizo.ar/noticias/fckeditor/file/butotem.pdfIn PDF document text
- http://vizit-k.net/uploads/editor/files/dedutonuxenunumuza.pdfIn PDF document text
- https://sfasg.jp/js/ckfinder/userfiles/files/subub.pdfIn PDF document text
- http://ardeche.proximeo.com/ckfinder/userfiles/files/62051718050.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002f7c05ec---sulofi.pdfIn PDF document text
- http://eikenhorstgroep.nl/userfiles/file/61489757195.pdfIn PDF document text
- https://biocoop.legreniervert.fr/ckfinder/userfiles/files/zapagesofuzorefab.pdfIn PDF document text
- http://unitec-egypt.net/userfiles/file/71975828039.pdfIn PDF document text
- https://aadhaarretail.com/administrator/imagetemp/file/tujew.pdfIn PDF document text
- https://ctsgroups.asia/images/file/jalowewederumopi.pdfIn PDF document text
- http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotizoja.pdfIn PDF document text
- https://ritascreation.com/userfiles/file/38359150205.pdfIn PDF document text
- https://vico-real-estate.com/ckfinder/userfiles/files/davutokegewevorelonadaso.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=lp+retardasi+mental+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_off0000cf3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF3C	17380 bytes
SHA-256: `54633335591f948e6c47ce43524647be62542bf892c04249c8abf000d8c19f4e`
`font_01_sfnt_off0000fc29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC29	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011440.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11440	10496 bytes
SHA-256: `7cd8a7746e1e5f7c3b33273fbf448970ac80240b158eceba8870253fbbf69a45`

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