PDF malware analysis — malicious · f4f35c2b1114d964

MALICIOUS

PDF

84.6 KB Created: 2021-09-24 10:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 014f832b6398ee2410140efa3e9970da SHA-1: 587219b8cc766470184dc1e6ccf7c5a2bf184e9f SHA-256: f4f35c2b1114d9649edfec7a106675a20bbe5a68e175a16f53c0a7941e70ea5c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=how+to+get+v+bucks+on+fortnite+for+free PDF link annotation
- http://machi-tomo.xyz/js/ckfinder/userfiles/files/tolaginukajaperalopusu.pdfIn PDF document text
- https://full-e.com/app/webroot/userfiles/files/20210919_160304.pdfIn PDF document text
- https://charterfori.ir/basefile/charterforiir/files/lozaguxenenep.pdfIn PDF document text
- https://nada70.org/userfiles/file/wivanogevusoka.pdfIn PDF document text
- http://unite-chem.cn/upload/files/zabetifumorapemijix.pdfIn PDF document text
- http://kpdb.org/userfiles/files/wujadefetozuxum.pdfIn PDF document text
- http://www.supair-lux.hu/ckfinder/userfiles/files/funevizona.pdfIn PDF document text
- http://inarchengineering.it/userfiles/files/wenamanuwidobonek.pdfIn PDF document text
- http://vaness-sens.fr/ckfinder/userfiles/files/26863566468.pdfIn PDF document text
- https://a-metal.e-giant.net/archive/file/files/81206427665.pdfIn PDF document text
- http://saeronbio.com/userData/board/file/30767584376.pdfIn PDF document text
- https://mldom.xyz/web/img/podborky/files/68904350553.pdfIn PDF document text
- https://tasivn.com/upload/ck/files/meboze.pdfIn PDF document text
- http://otvorene-srdce.sk/userfiles/file/58167609185.pdfIn PDF document text
- http://rund-sro.cz/UserFiles/File/46564104200.pdfIn PDF document text
- https://machinex-machines.com/UserFiles/File/25002142849.pdfIn PDF document text
- https://costarica4d.com/contents/files/tinimejorason.pdfIn PDF document text
- http://mevlanaasm.com/resimler/files/73028840727.pdfIn PDF document text
- http://music-saikung.com/ckfinder/userfiles/files/nelutagosiwokoxipetasugu.pdfIn PDF document text
- http://classicalgardenornaments.com/uplds/file/tifenobewejanimafopatozo.pdfIn PDF document text
- https://tmtteks.com/files/30329062378.pdfIn PDF document text
- http://elcampoeco.org/FCKeditor/file/65607424120.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef09c4c656---retufamosesumiwef.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/uino4i5fn6g50tlahg0jf33s06/faxikubekisamebawegixos.pdfIn PDF document text
- http://prosefkuchare.cz/userfiles/71806836720.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_off0000e297.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE297	18688 bytes
SHA-256: `295b51ccf62f656e50601001575dc6f8bf2a35775f409f76cfb6479154d26d22`
`font_01_sfnt_off00011345.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11345	10780 bytes
SHA-256: `616be321a26af280b110e10ffbe83e838ae809970fc18be675ca68274b6bd82f`
`font_02_sfnt_off00012c4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C4C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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