PDF malware analysis — malicious · f0eede4b3e66c85b

MALICIOUS

PDF

91.2 KB Created: 2021-10-06 19:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: c4899a29dda7a5c8004a9f3cc1f7da4d SHA-1: d770e7a661ec603e618f2076969317d2140b9ece SHA-256: f0eede4b3e66c85b87f8e81d628606235a4eb50edde0748bd0e7e33b6df1f0e4

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code. The numerous external URIs, many pointing to link farms on disposable hosting, indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=hungover+all+day PDF link annotation
- http://msslink.ru/userfiles/files/43465757862.pdfIn PDF document text
- http://naturallabs.fr/userfiles/file/fuketijodup.pdfIn PDF document text
- https://kingdom.vn/userfiles/file/25492631900.pdfIn PDF document text
- http://bnblspecialities.com/userfiles/files/59435981484.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613770b6de492---pefugometal.pdfIn PDF document text
- https://phatgiaolongan.com/upload/ckupload/files/39364821071.pdfIn PDF document text
- https://aiwcecckolkata.org/FCKeditor/file/losatiku.pdfIn PDF document text
- https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/94618025165.pdfIn PDF document text
- https://chatsystem.site/js/ckfinder/userfiles/files/96702682963.pdfIn PDF document text
- http://hightopeducation.com/cms_uploaded/file/44352459521.pdfIn PDF document text
- http://retrievers.su/ckfinder/userfiles/files/jagozuru.pdfIn PDF document text
- http://fruhmann-elektrotechnik.at/43513974601.pdfIn PDF document text
- http://ipsaix.com/ckeditor/ckfinder/userfiles/files/mimefomobijadazazagejo.pdfIn PDF document text
- http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/97328070083.pdfIn PDF document text
- https://coopinproject.eu/ckfinder/userfiles/files/67244325421.pdfIn PDF document text
- https://firstview.christoff-design.com/files/44028870914.pdfIn PDF document text
- http://stphilomenaonline.org/userfiles/file/67448040299.pdfIn PDF document text
- http://fantasymusic.it/userfiles/files/lasofekanawoni.pdfIn PDF document text
- http://campfirewtx.org/userfiles/file/ximuzexonabam.pdfIn PDF document text
- http://fred-robin.com/ckfinder/userfiles/files/zagum.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c09b8231d8991317172171528ed9b49e/wudakikaxox.pdfIn PDF document text
- https://vinaconexmec.vn/uploads/news_file/545775454.pdfIn PDF document text
- http://bancasemecanino.com/userfiles/files/zekivijilijinexelejowo.pdfIn PDF document text
- http://nilesk.com/userfiles/file/fusige.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_off00010150.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10150	18144 bytes
SHA-256: `66d98f7fc6d0add7d7f6e75f0662a69fdaa14e98a8345cd5c6dc1f3d1f54c9cc`
`font_01_sfnt_off00013022.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13022	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014839.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14839	10336 bytes
SHA-256: `44af8da7512779b239e189c41cef9b18e138e438fd8147c273c9371212489705`

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