PDF malware analysis — malicious · 66f98e977597f8f1

MALICIOUS

PDF

70.7 KB Created: 2021-09-23 18:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 0c530bf22374d7fcf62781a0999d6719 SHA-1: 2ad96a11e7e3fb3f912a9e96f7a67d769a7e0eca SHA-256: 66f98e977597f8f1d301f669cb31d4b6864cffbe3ddfd2fb1024276ad8da622d

132 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.8295

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.
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
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 http://mcenterdk.ru/fck_editor_files/files/72382481499.pdf In PDF document text
- https://propertiproperty.com/Uploads/userfiles/files/lexorunizisiro.pdfIn PDF document text
- https://daulte.ch/ckfinder/userfiles/files/defizivuwolufatesapom.pdfIn PDF document text
- https://schachverein-marchhoefe.ch/fcsr/news/upload/file/3792982409.pdfIn PDF document text
- http://gysanya.com/upload/file/210923060246932882r9cn8e7fc6n8.pdfIn PDF document text
- http://speckrepeg.by/UserFiles/files/pafatesaban.pdfIn PDF document text
- http://guchen.ru/d/files/85657069199.pdfIn PDF document text
- http://mwbright.com/upload_fck/file/2021-9-2/20210902191723903085.pdfIn PDF document text
- http://kondicionery-krasnogorsk.ru/upload_picture/file/40910003902.pdfIn PDF document text
- https://excore.hu/ckfinder/userfiles/files/96475294916.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f7965753a---nofemepirolilopikiw.pdfIn PDF document text
- http://paintmaster.hu/js/ckfinder/userfiles/files/97714376431.pdfIn PDF document text
- https://babetravelling.com/ckfinder/userfiles2/files/pazibesuxemasovatowez.pdfIn PDF document text
- http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3106536e6---8186759447.pdfIn PDF document text
- http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nolejixipaxinifimufi.pdfIn PDF document text
- https://hgindustrial.eu/userfiles/files/zifotirosebex.pdfIn PDF document text
- http://veraschwemmle.de/fckdata/file/91279546587.pdfIn PDF document text
- http://smm-mm.com/uploads/news_file/88803004855.pdfIn PDF document text
- https://rabudiagnostic.com/userfiles/files/piwubedorixezeximugudeles.pdfIn PDF document text
- http://tetobox-budapest.hu/uploads/files/14338799049.pdfIn PDF document text
- http://dokturmice.com/ckfinder/userfiles/files/80990422160.pdfIn PDF document text
- http://galsabino.it/userfiles/files/lojabawefofamimegezu.pdfIn PDF document text
- http://autodilykanka.cz/cmsimple/images/file/jukupafamaz.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cyber+bet+apk+downloadPDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d6a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6A7	10588 bytes
SHA-256: `5c69c1e391976607b7a20e9411abcc0101851682a51c9f4aa792a88be2f3e602`
`font_01_sfnt_off0000eeda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEDA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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