PDF malware analysis — malicious · cd3ede34718f08f2

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 10:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c666019b92f59597214a015edb04b0a8 SHA-1: 748f6109041a816b59a9be2f9c4f30e355b89b66 SHA-256: cd3ede34718f08f2dc341dd1da3a1d4fd6d9aa5596f8248a3437500b7982c464

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

Heuristics 5

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.
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://medvor.ru/uplcv?utm_term=how+to+manually+print+double+sided+pdf PDF link annotation
- https://tp-pos.com/uploads/image/files/13310392858.pdfIn PDF document text
- https://www.iieng.org/editor/ckfinder/userfiles/files/xuzigidovixa.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/h7a51qgd4l72a44nk4n9dokp9o/3387180978.pdfIn PDF document text
- https://egca.fr/userfiles/file/6308385631.pdfIn PDF document text
- http://olivetheater.com/userData/board/file/58149787663.pdfIn PDF document text
- https://bauarch.bg/files/51339405801.pdfIn PDF document text
- https://letstravelforacause.com/miet/assets/files/5533485569.pdfIn PDF document text
- http://luxmeterthai.com/ckfinder/userfiles/files/55431169937.pdfIn PDF document text
- http://geoass.eu/userfiles/files/4664616878.pdfIn PDF document text
- https://theipbuzz.com/images/file/2406272311.pdfIn PDF document text
- http://geologocarmignani.com/userfiles/files/vuraladokuwaxa.pdfIn PDF document text
- http://fd-health.com/upload/ckeditor/files/50348335032.pdfIn PDF document text
- http://jorkurojus.com/userfiles/file/50454060207.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/87519341562.pdfIn PDF document text
- http://tongchangkj.com/uploadfile/file///2021090515555029.pdfIn PDF document text
- https://oncallanatomist.com/ckfinder/userfiles/files/73894721605.pdfIn PDF document text
- http://camonetinternational.com/files/file/savulakisaxumu.pdfIn PDF document text
- http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/34989843101.pdfIn PDF document text
- https://www.larche-de-jules.fr/ckfinder/userfiles/files/jipok.pdfIn PDF document text
- https://aradovan.com/userfiles/file/97131445623.pdfIn PDF document text
- http://pol2-simf.ru/userfiles/file/84757032274.pdfIn PDF document text
- http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58547213287.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_off0000cf16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF16	16768 bytes
SHA-256: `d33ff16eb3641fb08177af5fc4eb6dbbe65c8fe7c39160419693cd90b3795e1e`
`font_01_sfnt_off0000fa62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA62	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011279.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11279	11092 bytes
SHA-256: `90364b1d2dc0cc62cf6580df3595404d9e9a73d5933db80143c49b243db601b7`

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