PDF malware analysis — malicious · 817f4c1ac66844f9

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 00:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: ae864ba4f42f12a48632be7307a15385 SHA-1: 407985bff2ed8884f4fd9d78d5c058871e690d00 SHA-256: 817f4c1ac66844f9d9d17913802fddf58706cecc11652677ba152db02461a209

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://synerhu.ru/uplcv?utm_term=redmi+note+8+next+update PDF link annotation
- http://akvatoria.by/UserFiles/files/86096386553.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e62f51296bfa3464a0be2a7787d39bc8/19187479767.pdfIn PDF document text
- http://doks-films.com/pcms/content/file/78309558254.pdfIn PDF document text
- http://csc020.com/userfiles/file/20210902165503_7fsg1n.pdfIn PDF document text
- http://kryotherapie.net/neu/userfiles/file/82511633565.pdfIn PDF document text
- http://tomasmrazek.cz/userfiles/file/3159953518.pdfIn PDF document text
- https://sarenpinler.com/calisma2/files/uploads/84723113341.pdfIn PDF document text
- https://aeternoplanning.com/ckfinder/userfiles/files/33864644977.pdfIn PDF document text
- http://dr-onesrl.com/userfiles/files/pupuje.pdfIn PDF document text
- https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/jetavosi.pdfIn PDF document text
- https://imahima.xyz/js/ckfinder/userfiles/files/87995474804.pdfIn PDF document text
- http://irodaszer.lukinserv.hu/file/zekepumuj.pdfIn PDF document text
- http://tecksco.com/upload/files/wibogiwubemenuk.pdfIn PDF document text
- http://architettotoma.it/userfiles/files/92981130170.pdfIn PDF document text
- http://dungcucaytrong.com/images/files/wepubafelujapivika.pdfIn PDF document text
- https://supermagnum-bg.com/ckfinder/userfiles/files/xozux.pdfIn PDF document text
- https://pasarangroup1.com/contents/files/lenuxugizawibaji.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161450357c11d9---67661769384.pdfIn PDF document text
- http://canphantich.net/Images_upload/files/luvevujubiz.pdfIn PDF document text
- http://slbreakingnews.com/ckfinder/userfiles/files/32079227616.pdfIn PDF document text
- http://sandlnae.com/data/editor/file/46368622552.pdfIn PDF document text
- http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11288766910.pdfIn PDF document text
- http://tfh-filter.hu/_user/file/56770537862.pdfIn PDF document text
- https://casartigianiudine.busletter.it/ckfinder/userfiles/files/32098911745.pdfIn PDF document text
- https://nationalshield-uae.com/userfiles/files/45228742967.pdfIn PDF document text
- http://theartofdesign.nl/ckfinder/userfiles/files/17010692291.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_off0000e0f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0F5	17716 bytes
SHA-256: `e923e19a6b8640b6fbae8bf0f5286c8da101c28c572872eeff4a9aa1fd89314e`
`font_01_sfnt_off00010e69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E69	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012680.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12680	10692 bytes
SHA-256: `5777395ebbb3dca0df5aa94165c72b08e7c9b9d84b1c292109bd79a6144e78e2`

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