PDF malware analysis — malicious · 5db052090658b33c

MALICIOUS

PDF

72.1 KB Created: 2021-09-09 01:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9e5c13d196b22bfff09e99b4120016f9 SHA-1: 2b07080bfce23b0f27e5df194b227b0b27e38aad SHA-256: 5db052090658b33c9ea35bc4fd64b67046bddeb5eb72daf3eb8af21b0654c3ed

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also contains numerous external URIs, many of which point to suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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://rana-international.com/userfiles/files/xejapitujixul.pdf In PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f6da0127b603ca805f84423f86f059f2/fogeni.pdfIn PDF document text
- https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/desofiginuwiteta.pdfIn PDF document text
- https://jungleflightchiangmai.com/Uploads/files/60990746391.pdfIn PDF document text
- http://olympiad-bigben.ru/ckfinder/userfiles/files/kenosomexovusawetusokon.pdfIn PDF document text
- https://eobliecky.sk/userfiles/file/6761983616.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392eecb4956---43972043162.pdfIn PDF document text
- http://wish-pharma.com/upload/files/popurokasawimufibapebud.pdfIn PDF document text
- https://catequesisnavarra.org/guiarte_userfiles/files/13659782529.pdfIn PDF document text
- http://sino-web.net/filespath/files/20210905124547.pdfIn PDF document text
- http://cu-mbc.com/ckfinder/userfiles/files/mulubuwipixes.pdfIn PDF document text
- http://renknh.com/ckupload/files/70499963928.pdfIn PDF document text
- https://www.lucaslobker.com/minor/ckfinder/userfiles/files/sizefamugowubovodi.pdfIn PDF document text
- http://pngroup.pl/ckfinder/userfiles/files/46601077457.pdfIn PDF document text
- http://queenart.kr/userData/board/file/51495799271.pdfIn PDF document text
- https://saksisan.com/upload/ckfinder/files/93276911812.pdfIn PDF document text
- http://easternhoteljeju.com/FileData/ckfinder/files/20210903_D4287DEAA59A822D.pdfIn PDF document text
- http://linhkienhunganh.vn/luutru/files/kirutukivomuk.pdfIn PDF document text
- https://notarbrazda.cz/userfiles/file/In PDF document text
- http://phanphoiongnhuahoasen.vn/upload/files/75612128246.pdfIn PDF document text
- https://knoxvilleremembers.com/media/41193300294.pdfIn PDF document text
- https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/61413911041.pdfIn PDF document text
- https://mashura.co/userfiles/files/zugedevigo.pdfIn PDF document text
- http://maslag.eu/userfiles/file/48797498276.pdfIn PDF document text
- http://katyababash.com/images/uploads/file/supofekudes.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=miracast+for+mxq+proPDF 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_off0000b6af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6AF	10600 bytes
SHA-256: `ffcb52aa832d938ee5d656b7908470b1261e25d9990dbc6d61fd012202df5598`
`font_01_sfnt_off0000cf01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF01	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e713.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE713	17128 bytes
SHA-256: `a4b8c17f3389ad7f2381b8946de6eeb4b904620d3f294776a1863b3f1d8d1a32`

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