PDF malware analysis — malicious · c3469ac361f02cde

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 14:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6d9ae602f0fd01b4ac54a282a75111a6 SHA-1: d221af49881c7e14fcc2cf7b71c34f94be00ebc8 SHA-256: c3469ac361f02cdec6f427b20a17c7ff351fdd2bcd35d65a107797109e3e7d56

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to the overall phishing attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://nomylo.ru/uplcv?utm_term=melon+chart+apk PDF link annotation
- https://weilaimachinery.com/userfiles/files/80883484889.pdfIn PDF document text
- http://arredamentoambienti.it/img/file/zukikexobup.pdfIn PDF document text
- https://valleyrentals.com/userfiles/file/diroxawun.pdfIn PDF document text
- https://gitteszoneklinik.dk/ckfinder/userfiles/files/tenanabitigesalab.pdfIn PDF document text
- http://sun-apartments.pl/data/pages/faloguroku.pdfIn PDF document text
- http://copy2d.com/ftp/image/file/291181467.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130df455a6ea---41458014577.pdfIn PDF document text
- http://xecuoihuyhoang.com/uploads/userfiles/file/11278765540.pdfIn PDF document text
- https://mediaget.ru/userfiles/files/50020096215.pdfIn PDF document text
- https://inprovitpuertorico.com/ckfinder/userfiles/files/rabikojufizawubowa.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2c9d95f48c97c25996b2f08ce04bc26d/43573932984.pdfIn PDF document text
- http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/40020441481.pdfIn PDF document text
- https://mimpi1pusat.com/contents/files/namanu.pdfIn PDF document text
- http://lamay.de/userfiles/file/66161789589.pdfIn PDF document text
- http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/46157061895.pdfIn PDF document text
- https://www.orthovision-lublin.pl/ckfinder/userfiles/files/bemegelowipixos.pdfIn PDF document text
- https://rajaketiga.com/contents/files/40194258245.pdfIn PDF document text
- https://bela.geekers.tw/upload/file_folder/file/81710817736.pdfIn PDF document text
- http://s-pack.kr/userfiles/file/20210913145515.pdfIn PDF document text
- http://anbao.vn/uploads/userfiles/file/zoridevag.pdfIn PDF document text
- http://stsmcc.org/www/js/ckfinder/userfiles/files/70501719682.pdfIn PDF document text
- http://kopdesign.nl/userfiles/file/davesiwewuketevomejujoje.pdfIn PDF document text
- https://www.stnedu.com/ckfinder/upload/files/50979792242.pdfIn PDF document text
- https://grupahatak.pl/admin/_fck_files/file/44444454351.pdfIn PDF document text
- https://phuketwebstudio.com/ckfinder/userfiles/files/11146657743.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_off0000ce7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE7B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e68d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE68D	20884 bytes
SHA-256: `075f6a59d28269cfbec954be16b166fbd7ef4f8f3936d52dc63cb8b9d96315be`
`font_02_sfnt_off00011c96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C96	10296 bytes
SHA-256: `6f3d0fd59631745c0e30d70bb40be06c200711919879fcf67df7686cdf01f401`

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