PDF malware analysis — malicious · 2fbce5008a8c70c1

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 02:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 2cc070a8c3ebc26ec22d8d6b6a59ca76 SHA-1: f58af2487441db45740638e02cfbda32e5292eef SHA-256: 2fbce5008a8c70c18fb494e037b75ba775434603ad412987aa2bca2b462ce9b1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also hosts a large number of external URIs, many of which are disposable and part of a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these external URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=sword+art+online+md+apk PDF link annotation
- https://konferencii.ru/js/ckfinder/userfiles/files/72283947394.pdfIn PDF document text
- http://wingmanresearch.com/userfiles/files/69475969646.pdfIn PDF document text
- http://chelseafoodmart.com/uploads/files/21835044126.pdfIn PDF document text
- https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/xufimijawabux.pdfIn PDF document text
- https://bnbcostaverde.it/userfiles/file/bamexoji.pdfIn PDF document text
- https://chokysitohang.com/Uploads/userfiles/files/24996290922.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139f900ba711---13270025751.pdfIn PDF document text
- http://aviteksural.ru/admin/ckfinder/userfiles/files/mimesevodos.pdfIn PDF document text
- http://perilatomsk.ru/ckfinder/userfiles/files/madikudulafakifesuroxi.pdfIn PDF document text
- https://nepalonetours.com/userfiles/files/lalilavozozezapala.pdfIn PDF document text
- https://laser123.com/geektic/files/90753451210.pdfIn PDF document text
- http://vandientuchinhhang.com/upload/files/36140826793.pdfIn PDF document text
- http://drxzhang.com/userfiles/file/pawop.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d8caeb444---lilajemajadebuwoxe.pdfIn PDF document text
- http://rulife.ru/ckfinder/userfiles/files/72176868367.pdfIn PDF document text
- https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/mugiwenuxobija.pdfIn PDF document text
- http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/xepixenubiwuzabafemajater.pdfIn PDF document text
- http://modern-pro.ru/files/file/lebupifatufujogovu.pdfIn PDF document text
- http://datavincity.com/uploads/ckfinder/files/19666341088.pdfIn PDF document text
- http://redemaisfarma.com/userfiles/file/puxififebegezivefek.pdfIn PDF document text
- http://turinimoti.com/assets/userfiles/file/zitibixuboraxasovelapa.pdfIn PDF document text
- http://boonfagrandhome.com/user_img/files/80375085612.pdfIn PDF document text
- http://studiolorenzino.eu/userfiles/files/desagawav.pdfIn PDF document text
- 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_off0000d733.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD733	18124 bytes
SHA-256: `b88c91ca389697c271a883a9c4f997085ed05da8f58d58294e26dc04e4a1efae`
`font_01_sfnt_off000106b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106B6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ecd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11ECD	10640 bytes
SHA-256: `c92b9a1503c2f1c22eb76a425a16ad4b86766a89b33bcf3814baff5c9917530f`

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