PDF malware analysis — malicious · 1529bee0d848c995

MALICIOUS

PDF

73.7 KB Created: 2021-09-09 22:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: be2c37af506207a0bb628af71c2e9816 SHA-1: bea0fa716caa6629237dbd019b3c832182626567 SHA-256: 1529bee0d848c995933d9e7ef75410469749cea71c94fabe8367ad123229ac54

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure malicious links within a large number of disposable domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://ketchas.ru/uplcv?utm_term=gta+5+apk+obb+2gb PDF link annotation
- http://tikatalog.sk/_files/file/18669256716.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b442e59f---vozobizegonurexisu.pdfIn PDF document text
- http://bangtaisay.com/uploads/userfiles/file/zobozubepifefadi.pdfIn PDF document text
- http://palazzodiaz.com/userfiles/files/susutefa.pdfIn PDF document text
- https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/743a5711754c4ee13d23b7a73f1d4a42/redazisefumexe.pdfIn PDF document text
- http://moretonassets.net/userfiles/najura.pdfIn PDF document text
- https://ntpuvoice.com/ckfinder/userfiles/files/9729748947.pdfIn PDF document text
- http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/66334366999.pdfIn PDF document text
- http://studiodrago.eu/userfiles/files/29570735963.pdfIn PDF document text
- http://asavn.vn/uploads/userfiles/files/29532397468.pdfIn PDF document text
- http://aumnat2car.com/ckfinder/core/connector/php/upload/files/tutosuzaw.pdfIn PDF document text
- https://ms01bet.net/contents/files/najepunixeparoxiwuza.pdfIn PDF document text
- http://carscaso.com/js/upload/files/zubusoperade.pdfIn PDF document text
- https://myagenda.myagenda.cz/pictures/editor/files/maxegubokap.pdfIn PDF document text
- http://bankerz.in/qpic/files/biwibedaliletevaga.pdfIn PDF document text
- http://stroisvias.ru/userfiles/file/33642709170.pdfIn PDF document text
- http://kelvista.lt/images/files/bubutemudukusefivif.pdfIn PDF document text
- http://skupka54.ru/upload/m/noredexezekijokotepal.pdfIn PDF document text
- http://spain-ex.com/images/blog/file/fuwefajigij.pdfIn PDF document text
- http://tweddlefoto.com/files_contenidos/upload/files/dukerinofolexoretumunala.pdfIn PDF document text
- https://emmaushuis.org/pages/39937767954.pdfIn PDF document text
- http://voijin.com/userfiles/files/24541508526.pdfIn PDF document text
- https://turismo-galicia.es/ckfinder/userfiles/files/felezava.pdfIn PDF document text
- http://www.fred-robin.com/ckfinder/userfiles/files/59919795686.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_off0000beaa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEAA	16908 bytes
SHA-256: `d53f7263b21b0d6fa47ed72b13d276d9e08d38c822bca8091760f994801b0ed3`
`font_01_sfnt_off0000ea36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA36	10312 bytes
SHA-256: `5ea1d807ce0fd8a8bf3dbe21ded427eb8254abea1110b331c78b6d6fa3fa4195`
`font_02_sfnt_off0001017c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1017C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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