PDF malware analysis — malicious · 6b51b1fe4113273f

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 16:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c0df216acdeaae70cd8c2850d7fb51e7 SHA-1: 37043b422c642da543b6e6c8678775321d5aec0c SHA-256: 6b51b1fe4113273fb74b1d1aa1ade470d2217ba3ebceb6c3a01fb689c8e605dc

114 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common social-engineering tactic. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is used for malicious purposes, likely to download further payloads or steal credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 6

Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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=can+you+add+extensions+on+chrome+mobile PDF link annotation
- http://salonorganica.ru/upload/files/5684992353.pdfIn PDF document text
- http://www.perchegouet.com/ckfinder/userfiles/files/46444382486.pdfIn PDF document text
- http://hkacca.com/userfiles/goxevipilukeboxusuw.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/23e3992d5b4f0357f1ea392fa9caf306/27830192173.pdfIn PDF document text
- http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/6883113405.pdfIn PDF document text
- http://zulassungsservice4you.de/bilder/file/wewikepod.pdfIn PDF document text
- http://petraifevronii.ru/ckfinder/userfiles/files/36655444901.pdfIn PDF document text
- http://thermcom.cz/userfiles/file/54736909331.pdfIn PDF document text
- https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/didelogafavobirozevuviwa.pdfIn PDF document text
- http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210908065800.pdfIn PDF document text
- https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1sr8r0rt8d9pie46o28es3f0dc/80131645068.pdfIn PDF document text
- http://firmen-bekleidung.at/userfiles/file/42228234950.pdfIn PDF document text
- http://telecycling.org/files/file/32953650663.pdfIn PDF document text
- http://tetobox-budapest.hu/uploads/files/gawivovoj.pdfIn PDF document text
- http://eiak.org/upload/editor/files/98251568319.pdfIn PDF document text
- https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/85367314758.pdfIn PDF document text
- https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/61582323946.pdfIn PDF document text
- http://wmsone.com/eimages/file/dofupozu.pdfIn PDF document text
- https://kingbakerypans.com/userfiles/file/84642578230.pdfIn PDF document text
- http://goksirkrupskimlyn.pl/img/upload/files/vewanabobumobezufig.pdfIn PDF document text
- http://yuanyoujie.vip/userfiles/file/70938280347.pdfIn PDF document text
- http://gewidor-gmbh.de/uploads/files/54289711480.pdfIn PDF document text
- http://webminmax.com/userfiles/file/somofozibabesagen.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_off0000d868.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD868	17916 bytes
SHA-256: `da9bc00d4348fa755121d884bc5bce27ae42ae52d2959dedc7d022d39ae67a68`
`font_01_sfnt_off000106b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ece.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11ECE	11124 bytes
SHA-256: `6502cf18d3d3503f7809604081ceebe461df09f83c813a82b844e5b7814b2c9b`

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