PDF malware analysis — malicious · 6d4953f8a8308449

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 08:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 783017bb0a66b903173efbbb4b017207 SHA-1: fa3aef8dc3270164cfe61ba56a7655694c2710c5 SHA-256: 6d4953f8a83084491d72354a9b1b30e38466d7c9e8db6cca75df343dbc10c62b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=logo+maker+app+download+for+android PDF link annotation
- http://ongxoanhdpe.vn/upload/files/zasejesibuvusaw.pdfIn PDF document text
- http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/29559107361.pdfIn PDF document text
- https://2ruoteexpo.it/ckfinder/userfiles/files/vizenogemigekosime.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143cc7ad3d46---41955460256.pdfIn PDF document text
- http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/dudujovufawov.pdfIn PDF document text
- http://tomei4x4.jp/js/upload/files/44831530274.pdfIn PDF document text
- http://abakus-routing.co.uk/ckfinder/userfiles/files/44313651329.pdfIn PDF document text
- http://www.ocptecnology.com/admin/uploaded/fck/file/nudinurezunopovasedaz.pdfIn PDF document text
- http://szyldkj.com/luodan/images/userfiles/file/gezog.pdfIn PDF document text
- http://appartenvue.net/appart/upload/images/milemolasabikajopevapiv.pdfIn PDF document text
- http://dotacjedlaoze.pl/userfiles/file/50574953728.pdfIn PDF document text
- http://weiddy.com/uploads/files/202109050925301252.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d11fc9a41---77196747339.pdfIn PDF document text
- http://templeton.sk/userfiles/file/wepupudekomuxevomudasuxe.pdfIn PDF document text
- http://astorandblack.net/emailer/userfiles/file/ganafigof.pdfIn PDF document text
- https://yodishit.com/uploads/userfiles/file/sotewifibomidoji.pdfIn PDF document text
- https://kipass.fr/userfiles/file/gakos.pdfIn PDF document text
- http://www.urbanwaterways.info/files/47898347358.pdfIn PDF document text
- https://ooo-kenk.ru/userfiles/file/furibivuper.pdfIn PDF document text
- https://xulynuocphangiathinh.vn/images/pic/file/64980422629.pdfIn PDF document text
- https://pmms-online.com/assets/file/44705224391.pdfIn PDF document text
- https://konteshamamotu.com/userfiles/file/50928051491.pdfIn PDF document text
- https://megalightgroup.lv/uploads/files/vilefaxukevifufivusoripe.pdfIn PDF document text
- https://onecre.com/images/content/files/xurirabapaguwiputofim.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_off0000c286.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC286	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000da9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA9D	10708 bytes
SHA-256: `a224952efc5b04409c140f36bfa63bd97a9f331a6f84ff7207b1b81789d4045b`
`font_02_sfnt_off0000f2ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2EF	17788 bytes
SHA-256: `c288c9caeed4f1039bb90cb7f6dd898b75d0fe28d647afc5b031c5a154c2b731`

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