PDF malware analysis — malicious · 36b0f819318fc781

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 17:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 263ca9afa6e9da29248d349caea41133 SHA-1: 3d7a0245dd0bc98795115ff9e45399cb2f36026a SHA-256: 36b0f819318fc781573e1cf65d1b03e660660d17d24da2f83b5f09ca5d0eb883

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://sys-svinding.dk/userfiles/file/21421581963.pdf In PDF document text
- http://toptoptraining.ru/img/upload/file/98621551544.pdfIn PDF document text
- http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/piduni.pdfIn PDF document text
- https://brincandoeaprendendo.com/fotosempresa/files/99771834970.pdfIn PDF document text
- http://kagoshimakojintaxi.com/userfiles/file/49511638630.pdfIn PDF document text
- http://proxima-design.cz/files/file/poderowijomovipo.pdfIn PDF document text
- https://abzesolar.com/uploads/files/zunesexesipapuxilepita.pdfIn PDF document text
- https://am-system.eu/ckfinder/userfiles/files/fijogaxux.pdfIn PDF document text
- http://quiltingacademy.com/fckeditor/userfiles/file/92557754998.pdfIn PDF document text
- http://metalzilembo.it/userfiles/files/xotujikigerozotiwazibi.pdfIn PDF document text
- http://itagqatar.zajeltel.com/itag/file/files/venuxutafegemigozajare.pdfIn PDF document text
- http://topas.lt/userfiles/file/97759793165.pdfIn PDF document text
- https://askisan.com/upload/ckfinder/files/40361477788.pdfIn PDF document text
- http://www.centralperdana.com/file/49566820200.pdfIn PDF document text
- http://daiichibus.vn/uploads/news_file/39136036231.pdfIn PDF document text
- https://pasarantogel2.com/contents/files/58880016213.pdfIn PDF document text
- http://arqing.es/ckfinder/userfiles/files/nanoranawazadodovepebefe.pdfIn PDF document text
- http://tonyprins.nl/images/uploads/file/jagezarulemubudoxoguxe.pdfIn PDF document text
- https://snpwachq.com/files/js/ckfinder/userfiles/files/madidexatavebufogimesu.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/735a129f106274bc36bcfe2722d9e498/jetuximotijev.pdfIn PDF document text
- http://iberia-ex.com/images/blog/file/77819905036.pdfIn PDF document text
- http://queenart.kr/userData/board/file/35146444219.pdfIn PDF document text
- http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/sifixav.pdfIn PDF document text
- http://seamacros.com/upload/file/22230566608.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tom+and+jerry+michael+penaPDF link annotation
- 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_off0000b7d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cfec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFEC	10720 bytes
SHA-256: `0b5ae50e7b6eebb7561d2aa3df6a9c9de8df2e32e2c10ef64c9126b0d0c07fbe`
`font_02_sfnt_off0000e836.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE836	16552 bytes
SHA-256: `5e99970e2c000d7504ff21e80e25af2915c220c32bc9499f8e70d23bd53a9fd9`

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