PDF malware analysis — malicious · 0fb636d8d154308e

MALICIOUS

PDF

103.0 KB Created: 2021-09-22 16:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: dc5580b7db387b065dff56f89e7993eb SHA-1: f03b5b6d9a6c7cbd7091fb88b00f482d6dc7fe18 SHA-256: 0fb636d8d154308e33f1b6ee2abd145e8e9c4b19e327652f01c4e06ec317d371

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The primary purpose appears to be directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9910

Heuristics 6

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
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://oniceh.ru/uplcv?utm_term=sonic+and+knuckles+unblocked PDF link annotation
- https://xtremefitksa.xbodyksa.com/ckfinder/userfiles/files/60078767438.pdfIn PDF document text
- http://stefanourso.com/public/userfiles/file/bepewipezatizogafipun.pdfIn PDF document text
- https://www.aicsmindia.org/ckfinder/userfiles/files/88783815562.pdfIn PDF document text
- http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/ribadag.pdfIn PDF document text
- http://wohntraumgmbh.at/wogaxetako.pdfIn PDF document text
- https://chachachat.info/js/ckfinder/userfiles/files/51402538849.pdfIn PDF document text
- http://arredamenticucinesiciliane.it/userfiles/files/dabodabelaxozetur.pdfIn PDF document text
- https://jdconstinc.com/ckfinder/userfiles/files/lesutegoxigosawunorawaxif.pdfIn PDF document text
- http://maychaybocaocap.com/app/webroot/uploads/files/59381807576.pdfIn PDF document text
- http://355353.ru/userfiles/file/85788199306.pdfIn PDF document text
- https://247christianity.org/fckeditor/userfiles/file/82898611891630457483.pdfIn PDF document text
- http://bienbao.net/uploads/files/94590894833.pdfIn PDF document text
- http://ashioke.com/images/library/File/lavuvenosedegubu.pdfIn PDF document text
- https://trexanh.net/upload/files/55196877195.pdfIn PDF document text
- http://remont-etalon.ru/upload/files/57446269567.pdfIn PDF document text
- https://fitvital.hu/userfiles/files/44689135486.pdfIn PDF document text
- http://bukvoznaika.ru/ckfinder/userfiles/files/46312419527.pdfIn PDF document text
- http://ambvetbrashersclavoghisu.eu/userfiles/files/nugaratitegawuju.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2e479403c543469f2552caac99b83425/23587856940.pdfIn PDF document text
- http://zulassungsservice4you.de/bilder/file/nibijaguviwig.pdfIn PDF document text
- http://dlabiura.kbo.pl/ckfinder/userfiles/files/zinonajigevoberazekana.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145775ba4e66---69391753710.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000119b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119B0	10572 bytes
SHA-256: `bd14da06bc22c369166b9d5bc46a910e8532a0f247e419e8159cee150e3382f3`
`font_01_sfnt_off000131db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131DB	1820 bytes
SHA-256: `ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c`
`font_02_sfnt_off00013a61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A61	23256 bytes
SHA-256: `38d6e0418c32303196ffdb759e3755d2146732dc1cc0c8b4a758264ea1de1c8c`
`font_03_sfnt_off0001763a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1763A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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