PDF malware analysis — malicious · c86566902b6fbc1d

MALICIOUS

PDF

75.9 KB Created: 2021-09-14 02:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: dc388c74f4cd4c0b3d08185fc94c8460 SHA-1: ccb289e8fe4edcaf5a836567d55fddac94baa6cb SHA-256: c86566902b6fbc1dce96def9963af82f27ddf643da3a34744edf30d54130a952

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high number of external URIs pointing to disposable hosting. The PDF structure and numerous links suggest a phishing or malware distribution lure, likely delivered via spearphishing attachment. The embedded JavaScript is likely used to redirect the user to one of the external URLs.

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://pixomot.ru/uplcv?utm_term=intro+to+thermal+physics+schroeder+pdf PDF link annotation
- http://lavalnerina.com/userfiles/file/71765760302.pdfIn PDF document text
- https://e-fasteners.eu/media/file/wozogulaxelaj.pdfIn PDF document text
- https://lanna-flyingclub.com/ckfinder/userfiles/files/pegefubonabor.pdfIn PDF document text
- https://huangs.tw/uploads/files/202109060122412168.pdfIn PDF document text
- https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/wosilotabuviduvipefow.pdfIn PDF document text
- http://pcccphucvinh.com/upload/files/97022505564.pdfIn PDF document text
- https://dewalt-naradi.cz/media/upload/editor/file/14838098298.pdfIn PDF document text
- http://bilmatbasim.com/userfiles/file/24217926686.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161343ddc752dc---7365867874.pdfIn PDF document text
- https://soenen-pneus.com/upload/file/61257723408.pdfIn PDF document text
- http://dubilex.com/userfiles/files/59112203052.pdfIn PDF document text
- https://aquaprosmart.com/userfiles/files/30400298450.pdfIn PDF document text
- https://linardi.ru/files/file/81191714822.pdfIn PDF document text
- http://sgrappresentanze.eu/userfiles/files/95722788445.pdfIn PDF document text
- https://firmabudowlanawalczak.pl/web/uploads/files/vabemupiwovodolow.pdfIn PDF document text
- http://vertex-decor.com/userfiles/file/22386279505.pdfIn PDF document text
- http://bezpiecznamlodosc.org/files/file/sezutupeboremapojumerogop.pdfIn PDF document text
- http://assytekservizi.com/userfiles/files/womonexevibovefoma.pdfIn PDF document text
- https://partroyfuneralhome.com/partroy/assets/file/53652599929.pdfIn PDF document text
- http://elsped.hu/files/file/lumotivanure.pdfIn PDF document text
- http://ncteonline.com/userfiles/file/16213527741.pdfIn PDF document text
- http://aasghsflqsae.handylover.com/upload/files/95897485380.pdfIn PDF document text
- http://villaelen.it/userfiles/files/xiwumunuzatudake.pdfIn PDF document text
- http://thanhtindesign.vn/uploads/image/files/sugujigad.pdfIn PDF document text
- http://trungnguyenjsc.vn/uploads/image/files/bavezokefejowixuwoxoses.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_off0000c526.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC526	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD3D	10948 bytes
SHA-256: `f7416849443684bac7066d58a4cc6b9ba0686f30fa0fb48d45d5b5ca5d35ee1e`
`font_02_sfnt_off0000f66d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF66D	16784 bytes
SHA-256: `390be2d38ebc98ba8d619389c5e95a5fe30759e695930fa5d8aa0ee47c70a74c`

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