PDF malware analysis — malicious · 568050e477c2d597

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 16:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 539bc8684f665aff08607c03290a3eca SHA-1: c5dd143df1f9f209f5c23a4070fd4b9e367019a5 SHA-256: 568050e477c2d597d8c3c819b81df55a36ec1346f6c60bc9e9d67984f814abbb

132 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.7445

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://ministryofrum.com/memlogos/file/41628426587.pdf In PDF document text
- http://msdoubrava.cz/foto/images/file/luput.pdfIn PDF document text
- http://hb1004.com/userData/board/file/bazabisox.pdfIn PDF document text
- https://shipnhanh247.vn/asset/files/3265715110.pdfIn PDF document text
- http://hmsendo.pl/uploads/editor/file/30754034696.pdfIn PDF document text
- http://fukaofoods.tw/uploads/files/202109020822375605.pdfIn PDF document text
- http://ascensionchina.com/userfiles/file/dunul.pdfIn PDF document text
- http://pm-ural.com/uploads/files/8395497239.pdfIn PDF document text
- http://yizhu580.com/ckfinder/userfiles/files/92881203828.pdfIn PDF document text
- https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/34737424871.pdfIn PDF document text
- https://hitourkorea.com/FileData/ckfinder/files/20210912_4860668BB96FB2CF.pdfIn PDF document text
- http://jrecchina.com/ckeditor/ckfinder/userfiles/files/gatufarasobixogogew.pdfIn PDF document text
- https://yuanfuconstruction.com/ckfinder/upload/files/bizuramefoji.pdfIn PDF document text
- http://etpatatietpatata.com/userfiles/files/36386841081.pdfIn PDF document text
- https://estudiowebcolombia.com/ckfinder/userfiles/files/11556863649.pdfIn PDF document text
- http://mobydick-band.de/fckdata/file/11730652919.pdfIn PDF document text
- https://s-oil.hoakhanh.vn/uploads/image/files/35837491081.pdfIn PDF document text
- http://eortak.com/img/fck_temp/file/92021682283.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be15f2c523---kakas.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/92880700679.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ddf0eed1---kukisutizosigujato.pdfIn PDF document text
- https://habibitours.org/ckfinder/userfiles/files/xupetex.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=words+with+friends+classic+apkPDF link annotation
- https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/takojubizixo.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c86c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC86C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e07e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE07E	16784 bytes
SHA-256: `239d5a11b8a5de29916706fa89b2b45bcc66490d1e51737dfcdbf191b86e6ea0`
`font_02_sfnt_off00010bd3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BD3	3272 bytes
SHA-256: `51a9156c15131cf7b39c260ec72555e45c736be0cd96c4ed29febf7931d52303`
`font_03_sfnt_off0001192c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1192C	10888 bytes
SHA-256: `1aeb140102153cabf39c96acb278a92562bc8e849246ecf98e98c90c4e052bc1`

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