PDF malware analysis — malicious · e35d661982bc19b4

MALICIOUS

PDF

72.1 KB Created: 2021-09-10 06:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 85cd4e8dca7d17e14abe3ffcb2c6a17c SHA-1: 12b57d91313a986da403f9e2de7b4bd50672ac63 SHA-256: e35d661982bc19b4827bebc1463c1ad29fb19ae80e9fb9f9db4a690adb3fe128

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains, indicating a link farm designed for phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

Nyx PDF Classifier suspicious score 0.4750

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://svb-volleyball.de/userfiles/file/13550655316.pdf In PDF document text
- https://ferado.vn/userfiles/file/jiruw.pdfIn PDF document text
- https://sibiucuratenie.ro/fckeditor/userfiles/file/4833616368.pdfIn PDF document text
- http://guides2alpes.fr/uploads/file/ditufutipanesadepisupula.pdfIn PDF document text
- http://demenagements-remond.fr/userfiles/file/20210907221102.pdfIn PDF document text
- http://blossomtour.net/FileData/ckfinder/files/20210909_310FADA4A8F2804D.pdfIn PDF document text
- http://goldenstarhotel.vn/images/uploads/files/wotiboxi.pdfIn PDF document text
- http://indyztyle.com/ckfinder/userfiles/files/5869918683.pdfIn PDF document text
- http://asbazainville.org/userfiles/file/rifetujugapuzerapumebal.pdfIn PDF document text
- https://vanphongphamhienluong.com/upload/files/pakubatiwonavalapopow.pdfIn PDF document text
- https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/32374435316.pdfIn PDF document text
- http://santiagoporter.com/js/ckfinder/core/connector/php/files/63184668481.pdfIn PDF document text
- https://www.comperat-89.fr/ckfinder/userfiles/files/53675468296.pdfIn PDF document text
- http://tandartsindex.nl/images/uploads/buxekefuvavuvadibor.pdfIn PDF document text
- http://rasciindia.com/firetech/ckupload/files/85662691836.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/putre6l3kr91nsfq4iiqd0sl8n/81589309751.pdfIn PDF document text
- http://lianbang123.com/uploads/files/202109090559493108.pdfIn PDF document text
- http://casaledellasignora.it/userfiles/files/sagori.pdfIn PDF document text
- http://nbc.com.vn/ckfinder/userfiles/files/10986950203.pdfIn PDF document text
- https://khambenhxahoi115.com/images/files/45175362584.pdfIn PDF document text
- http://mopron.ru/upload/files/nejewes.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390e4a38c31---wesebenudoxu.pdfIn PDF document text
- https://horkolas-gatlas.hu/ufiles/file/26152357282.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ing+home+bank+aplicatie+androidPDF 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_off0000d30c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD30C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eb23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB23	10976 bytes
SHA-256: `a3d913274874ce1a6b8592ae569f9ccc59a37d8402f780ca5d3253382da48184`

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