PDF malware analysis — malicious · 65439a767d7be966

MALICIOUS

PDF

90.3 KB Created: 2021-09-14 21:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d62848b52af45f17fd6ec125c5f4a235 SHA-1: a0ddfbbb53dc5d9f081bce23cd04bcb1cdd5a4c0 SHA-256: 65439a767d7be966d0779b2823e145ae4f736e942338ceb7c13d13abd8da7c8e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The presence of numerous external URLs, many on disposable hosting and using UTM parameters, suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=bloons+td+battles+lucky+patcher PDF link annotation
- http://ferrocom-spb.ru/userfiles/files/64323954632.pdfIn PDF document text
- https://www.agencesramos.com/ckfinder/userfiles/files/49277974867.pdfIn PDF document text
- https://asiarsolutions.com/userfiles/file/7587383331.pdfIn PDF document text
- https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/bofepola.pdfIn PDF document text
- https://stabiactiv.com/userfiles/file/73471107017.pdfIn PDF document text
- https://marathonblainville.com/userfiles/files/71494384223.pdfIn PDF document text
- https://limblength-sldf.com/userfiles/file/28134947184.pdfIn PDF document text
- http://montagnobozzone.it/userfiles/files/gasuwilonefezesedogi.pdfIn PDF document text
- http://dkmmotor.com/files/userfiles/file/robarubaju.pdfIn PDF document text
- http://xuanfe.com/uploads/FCKeditor/file/kosedijinuja.pdfIn PDF document text
- http://e2ingenieros.com/ckfinder/userfiles/files/62275265601.pdfIn PDF document text
- http://rnralpha.cz/res/file/94762829159.pdfIn PDF document text
- https://okazionche.com/files/tebuwifa.pdfIn PDF document text
- http://ahrestygz.com/userfiles/files/20210911_092321.pdfIn PDF document text
- http://abbwingslynnhaven.com/uploads/files/vevuwodo.pdfIn PDF document text
- http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/bodaketajafapijifozes.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8947f364---kubumu.pdfIn PDF document text
- http://pastoret.it/userfiles/files/79574739399.pdfIn PDF document text
- https://biroestarsa.hu/uploads/file/88841992191.pdfIn PDF document text
- https://savitravel.ro/ckfinder/userfiles/files/tolonataduvef.pdfIn PDF document text
- http://daehnfeldt.com/userfiles/file/purikimad.pdfIn PDF document text
- http://twtipa.com/upfile/files/2021/09/06/6477874095.pdfIn PDF document text
- http://85560891.com/upfolder/e/files/20210913035524.pdfIn PDF document text
- http://oreoltour.ru/sites/default/files/file/96056817514.pdfIn PDF document text
- https://petrovsky14.ru/docs/files/ziwutesogafefimokigi.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_off0000f7da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7DA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010fec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FEC	19304 bytes
SHA-256: `eafba9d85b26b2a2b9e384ee1732d160a903b16b0fe39f40e43c664f185eb182`
`font_02_sfnt_off000141d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141D0	11016 bytes
SHA-256: `cc0b8df00121338361d66f321d1bd7a8c12299b617ec1524fb1529bde20a56ac`

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