PDF malware analysis — malicious · 0ec22106cd241944

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 03:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: dfbf3545361603935d9bf5eecf1a5e11 SHA-1: 35d09940876e4c659f79dc1aa866f9a3338764fd SHA-256: 0ec22106cd2419447f95c1233d554b42b1e87c7ac71b763b279d1efb20586126

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous links to external PDFs hosted on various websites, with one identified as a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious PDF files, which are designed to deceive users.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://gruaszarate.com/ckfinder/userfiles/files/vegajuposiwedajamu.pdf In PDF document text
- http://cathugo.de/res/wysiwyg/file/vuzupofig.pdfIn PDF document text
- http://dorp.pl/userfiles/files/rivudepabonazatoxoromid.pdfIn PDF document text
- http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/biwojesedadez.pdfIn PDF document text
- http://www.520amis.com/upload/files/kegejugidojelivol.pdfIn PDF document text
- http://parejalecaros.com/adjunto/upload/fck/files/levorazo.pdfIn PDF document text
- http://stavo-bazar.cz/userfiles/file/nixugakaxirudiguse.pdfIn PDF document text
- http://puebloexec.com/userfiles/file/68612799370.pdfIn PDF document text
- http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/63553855179.pdfIn PDF document text
- http://kompassztuki.pl/Image/files/92334517309.pdfIn PDF document text
- http://foto-recepty.sk/images/fotky/favofotakalamibasumazuwo.pdfIn PDF document text
- https://ovistar-dz.com/ckfinder/userfiles/files/gozemaxowuk.pdfIn PDF document text
- http://rosabaum.de/web/editor/files/20528080408.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0526c572---wabenetimajarubip.pdfIn PDF document text
- http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagur.pdfIn PDF document text
- https://mkycc4.com/kycc4.com/userfiles/files/43491424457.pdfIn PDF document text
- http://parejalecaros.com/adjunto/upload/fck/files/20205433959.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd2272087---84786010358.pdfIn PDF document text
- http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/fopofadofagu.pdfIn PDF document text
- https://108pizza.pl/uploads/userfiles/files/sepunotunutorelulabapo.pdfIn PDF document text
- http://frickcontrols.com/uploads/files/keguwasukomezo.pdfIn PDF document text
- http://onlinetalk.jp/app/webroot/img/fckfiles/file/49655101088.pdfIn PDF document text
- http://home-plast.ru/foto/files/xojurotukowigule.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=teacher+cv+pdfPDF 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_off0000dfb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFB1	17452 bytes
SHA-256: `4772bf7e6299f3c8868d221189b6e1800f90675866dc300c9022fa862f772bbc`
`font_01_sfnt_off00010ccb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CCB	10120 bytes
SHA-256: `33008abd77324055a8d08088e69437ffc237a36b45923eb96e78420ef1e7aa1b`
`font_02_sfnt_off0001237f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1237F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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