PDF malware analysis — malicious · 906732bce52d319d

MALICIOUS

PDF

83.4 KB Created: 2021-09-22 13:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 55d34bb92ba12fc26e045353374d2b61 SHA-1: 3498306b417b85841a5621253f0016ee00245727 SHA-256: 906732bce52d319dc64f3ba5a5e277f1441aaf9ef865722096b2e7892bd8938e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with critical and high severity firings. The presence of embedded JavaScript and numerous external URIs indicates a malicious intent, likely to redirect users to phishing sites or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=hushed+apk+gratis PDF link annotation
- https://xn--z4qq44i.xn--kpry57d/upload/actfiles/bewenado.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135a61a17591---nopelotijudaze.pdfIn PDF document text
- http://gerastar.com/userfiles/file/69174633532.pdfIn PDF document text
- http://traiteur-ribot.fr/userfiles/file/xiluzi.pdfIn PDF document text
- http://madiagranitosilano.it/userfiles/files/gefetozukuwokafin.pdfIn PDF document text
- https://happyjourney.webtrails.in/ckfinder/userfiles/files/16568299394.pdfIn PDF document text
- http://fjzy18.com/image/uload/files/gulat.pdfIn PDF document text
- http://piemonteforyou.it/userfiles/file/56096893750.pdfIn PDF document text
- http://musikpark-live.de/userfiles/file/rofagubuwuk.pdfIn PDF document text
- http://hansungid.com/userfiles/file/wixuregodoxizozidesop.pdfIn PDF document text
- https://www.algeos.com/js/ckfinder/userfiles/files/80444000283.pdfIn PDF document text
- http://autosklo.sk/pictures/file/97023631341.pdfIn PDF document text
- https://gegeny.hu/uploads/file/79427593757.pdfIn PDF document text
- http://yuli-china.ru/d/files/98561995467.pdfIn PDF document text
- http://a2kat.ru/userfiles/file/33750770002.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4e61533066faf90b589b10ad72a8b20d/foponudalemazuzi.pdfIn PDF document text
- https://ienter.bg/files/rafane.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161390a2760ef4---91957429777.pdfIn PDF document text
- http://nuovartea.eu/userfiles/files/nirisobumowi.pdfIn PDF document text
- https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/tebabu.pdfIn PDF document text
- http://gutachterbewertung.de/userfiles/file/pipibuvase.pdfIn PDF document text
- http://www.pilatesyoga.hr/files/files/kovovemapebukedo.pdfIn PDF document text
- http://sztarmedia.hu/_user/file/wimusawogiza.pdfIn PDF document text
- https://pacantioquia.org/aym_image/files/xawuxeg.pdfIn PDF document text
- http://www.prodomasa.com/ckfinder/userfiles/files/46085977321.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_off0000dede.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEDE	19272 bytes
SHA-256: `42da4988e5f642ae5d4ab1d0755e52319c09348848df44e90d4de3aad66c4d9d`
`font_01_sfnt_off00011048.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11048	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001285f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1285F	10584 bytes
SHA-256: `d06c83082a0a031dbb4dc2eb0a7741ece06d3355c065f9e7936ff7850c424b02`

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