PDF malware analysis — malicious · 8c4c7ce7324845d3

MALICIOUS

PDF

72.3 KB Created: 2021-10-02 17:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: ca8475f2da953d3131bf501793692d81 SHA-1: 888b2eb5a6f9a12136856646c116342bf92df257 SHA-256: 8c4c7ce7324845d3e904ab709e4f9013f8f95558e6e28dd6e07f5357984b5615

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for redirecting the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=non+destructive+testing+in+civil+engineering PDF link annotation
- http://sinoscaform.com/upload/ckimg/files/202109041401002980.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88c813798---gipenusuxojapuperuxe.pdfIn PDF document text
- http://opusincertum.it/userfiles/files/somilesosobeged.pdfIn PDF document text
- http://webbyshoe.com/fckeditor/userfiles/file/92335623447.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/255588f2f065fa247634c7307e70bb34/jeriner.pdfIn PDF document text
- https://lapalettedesarts.fr/gestion/file/6877338837.pdfIn PDF document text
- https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/wadenarotabewubi.pdfIn PDF document text
- https://grafconsulting.pl/Upload/file/wajidejoj.pdfIn PDF document text
- http://ozkayalarlojistik.com/userfiles/file/79136164082.pdfIn PDF document text
- https://vinacoma3.vn/userfiles/file/41827705541.pdfIn PDF document text
- http://abwferrellpkwy.com/uploads/files/81806325477.pdfIn PDF document text
- http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/1377558544.pdfIn PDF document text
- http://millecolori.it/images/file/68434583349.pdfIn PDF document text
- http://sarica.com.tr/ckfinder/userfiles/files/fukalof.pdfIn PDF document text
- https://wrd13.com/force/file/10006402311.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/33947824982.pdfIn PDF document text
- http://xn--80aa5alfu.kz/file/turam.pdfIn PDF document text
- https://rusepress.com/uploads/wysiwyg/files/65673437393.pdfIn PDF document text
- http://bsbcarpet.com/userfiles/file/41135436253.pdfIn PDF document text
- http://plymouth-logs.co.uk/ckfinder/userfiles/files/nogafujis.pdfIn PDF document text
- https://indobaliart.com/sitefiles/file/buwikogazebabepulujawut.pdfIn PDF document text
- https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/rokazoniwasolifa.pdfIn PDF document text
- http://marcus-1.com/FileData/ckfinder/files/20210922_B7F098FD26A929BC.pdfIn PDF document text
- https://razredna-nastava.net/files/40585711164.pdfIn PDF document text
- http://greenhere.cn/upload/ckimg/files/202109180543509914.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_off0000b363.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB363	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cb7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB7A	10528 bytes
SHA-256: `2d191ada34eacfa5acd3b37f76c4af3bec320a6d03f3ec155ac3bbe69ac40b35`
`font_02_sfnt_off0000e35f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE35F	18480 bytes
SHA-256: `ec775a106b914b8928cf76f8c2a6a43b6d6f687d669076ef9243170145061947`

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