PDF malware analysis — malicious · 4ffdbb32c074115c

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 19:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 7a8e8412eadd29c031f2720847149a7e SHA-1: 44950037c98d20c5a62b493461f95e8861f094f8 SHA-256: 4ffdbb32c074115cb5ed83fdaffcb4d2d195865535491b4831ad5c7f6c4164e0

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://tese.in/ckfinder/userfiles/files/89428511095.pdf In PDF document text
- http://www.smartlandgroup.com/ckfinder/userfiles/files/neduzav.pdfIn PDF document text
- http://birkhoffhi.com/userfiles/files/tobigagafukoba.pdfIn PDF document text
- http://tomasmrazek.cz/userfiles/file/tinetaguvawovuzo.pdfIn PDF document text
- http://hwangtosidae.com/userData/ebizro_board/file/94847871371.pdfIn PDF document text
- https://www.piramideidiomas.com/ckfinder/userfiles/files/zenametekebumipotax.pdfIn PDF document text
- https://balticstroy.com/uploads/files/91154383759.pdfIn PDF document text
- http://tpdw.pl/userfiles/file/23575565941.pdfIn PDF document text
- http://mishelik.ru/userfiles/file/40534370458.pdfIn PDF document text
- https://bya-ingenieria.com/ckfinder/userfiles/files/riwawav.pdfIn PDF document text
- https://paymentor.nl/uploads/file/folusuf.pdfIn PDF document text
- http://lexen.ca/userfiles/files/sijexijidisuforawijanatuf.pdfIn PDF document text
- https://fainitelecommunication.com/public/editorfiles/file/nebowaripexewaxe.pdfIn PDF document text
- https://bangprice.com/bangprice.com/beta/cms_image/file/lazuzu.pdfIn PDF document text
- http://ineke-ott.nl/keramiek-beelden-imagesfile/lotog.pdfIn PDF document text
- http://teleinwestor.pl/userfiles/file/62624897189.pdfIn PDF document text
- http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/vixotidorob.pdfIn PDF document text
- http://reclameindex.nl/images/uploads/kadepigivilewatatabomije.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161324d15291c1---55186264914.pdfIn PDF document text
- http://birizgardenhotel.com/userfiles/file/fumepagejerokifufudexekun.pdfIn PDF document text
- http://etasystem.net/userfiles/files/timesogag.pdfIn PDF document text
- https://piauiaqui.com/ckfinder/files/xagidadasiliponuv.pdfIn PDF document text
- https://ncsccalgary.com/userfiles/files/83255674933.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/85788804345.pdfIn PDF document text
- http://cmsrecuperocrediti.it/images/file/22075064377.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ept+practice+test+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_off0000c079.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC079	10324 bytes
SHA-256: `6b5614da19d221f590b73cb1ed3a26f4082e60652d5b2885870c14be2cae0ebf`
`font_01_sfnt_off0000d7ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7EA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000effc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFFC	18112 bytes
SHA-256: `63fa76850034b8deeaf967ee9c64137c97c0c9270cc46eb5729f95c9d1f9570e`

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