PDF malware analysis — malicious · a00f0738776c3dca

MALICIOUS

PDF

77.7 KB Created: 2021-10-14 02:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: c5bf152cb74d8bad77ee7d1f31dcd4e1 SHA-1: 72950d990cb7899220f2ce8f77d00c2f5d71dd79 SHA-256: a00f0738776c3dca0678a3a30c66f574968157090c668ad78bd6f80c3eafc6d8

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware through the linked PDFs. The presence of embedded JavaScript suggests it may be used to obfuscate links or perform initial actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/95854942680.pdf In PDF document text
- http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/89426942196.pdfIn PDF document text
- http://epoch-making.jp/js/upload/files/34565413095.pdfIn PDF document text
- https://mtmnetwork.net/uploadEditor/files/92183215559.pdfIn PDF document text
- http://miass.realxenon.ru/uploads/files/31558264222.pdfIn PDF document text
- https://digireg.es/upload/39678309384.pdfIn PDF document text
- http://boki.hu/editor_up/43787980954.pdfIn PDF document text
- http://latexindia.com/userfiles/file/22631272242.pdfIn PDF document text
- http://thedewakohchang.com/image/upload/File/axokefinezuvawax.pdfIn PDF document text
- http://wuyioutdoor.com/userfiles/file/jelirejagemivaviriza.pdfIn PDF document text
- https://coonvalleycc.com/userfiles/file/mazuxapuwe.pdfIn PDF document text
- http://energy-labels.nl/userfiles/file/30560347347.pdfIn PDF document text
- https://ribaczpeter.hu/files/file/72768014877.pdfIn PDF document text
- https://betamachinery.sa/other_files/File/29356428185.pdfIn PDF document text
- http://aalzkj.love-mrt.com/upload/files/90002037631.pdfIn PDF document text
- http://visit-pune.com/userfiles/file/deluf.pdfIn PDF document text
- http://writtenmail.com/upload_images/file/56329034580.pdfIn PDF document text
- http://nhuaduongnhapkhauaz.org/upload/files/sorewujikoporewi.pdfIn PDF document text
- https://normec-cm.com/ckfinder/userfiles/files/vimazoxujofegedil.pdfIn PDF document text
- http://elisa5888.com/shopadmin/upload/files/baturexamixupuxiwekanola.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16163b005b0dde---vewugubat.pdfIn PDF document text
- http://danieldesignpro.com/userfiles/paxaroborunulimuwopubu.pdfIn PDF document text
- http://travelci.ru/ckfinder/userfiles/files/podaloredajerape.pdfIn PDF document text
- http://sushiyaslo.com/uploads/files/wazunukibiza.pdfIn PDF document text
- http://geometracosentino.com/userfiles/files/momagowenekufus.pdfIn PDF document text
- https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=run+everyday+to+lose+weightPDF 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_off0000c94e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC94E	10936 bytes
SHA-256: `51ff6566cfac143c540fc12e829d8f08d36854acd284caa55b556db07ee45e0e`
`font_01_sfnt_off0000e27b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE27B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fa8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA8D	18008 bytes
SHA-256: `47eba97c58a8ebb3c6df6ab39184eaca2359b5a01049a13297d2a8cdce8e4692`

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