PDF malware analysis — malicious · 31bc4d8dcdeb02cd

MALICIOUS

PDF

83.9 KB Created: 2021-10-05 21:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 57d6f903a9371567867797f0217fdf4e SHA-1: 1c5768682e7254b3d030d6b6d9852bc699ff1aa2 SHA-256: 31bc4d8dcdeb02cd5703bb4d7e0b61777c0e78d5466a911505e7e9fbe4d1ba48

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=difference+between+first+and+third+world+countries PDF link annotation
- https://magyar-logyogyasz.hu/fileok/file/gurotumofeguxutetupejib.pdfIn PDF document text
- http://congtyvima.com/images/Download/24565640688.pdfIn PDF document text
- http://luyutea.net/v15/Upload/file/2021929647235326.pdfIn PDF document text
- http://togclick.com/media/userFckfiles/file/vudovorilujasosaramosu.pdfIn PDF document text
- https://shioturboapi4-xyz.com/contents/files/fuzezi.pdfIn PDF document text
- http://aedelsur.com/contenido/files/lipafufagomimixes.pdfIn PDF document text
- https://inprovitpuertorico.com/ckfinder/userfiles/files/43695156369.pdfIn PDF document text
- http://germainelecocq.it/userfiles/files/rifagom.pdfIn PDF document text
- http://pkpneu.cz/userfiles/file/18647434132.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f3d83e53---49659602930.pdfIn PDF document text
- http://agriturismolescuderie.eu/userfiles/files/30251010784.pdfIn PDF document text
- https://pellevah.com/upload/files/sojokotiretero.pdfIn PDF document text
- http://monterroso-construpuntos.com/campannas/file/wipodazutolobif.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1db9afd48---19578368816.pdfIn PDF document text
- http://yuh-tarng.com/userfiles/file/dafujexalenu.pdfIn PDF document text
- https://bursac.net/userfiles/file/94258763903.pdfIn PDF document text
- https://inprovitchile.com/ckfinder/userfiles/files/67967669454.pdfIn PDF document text
- http://abnigakgdsg.friendship-match.com/upload/files/pewuwi.pdfIn PDF document text
- http://gernano.eu/gfx/userfiles/files/sagewetigi.pdfIn PDF document text
- https://binarbaidfabrication.com/public_html/userfiles/file/luxekotuk.pdfIn PDF document text
- https://gameadvisers.com/js/new/fckeditor/userfiles/file/72692371267.pdfIn PDF document text
- http://color-gateway.com/userfiles/file/87039209711.pdfIn PDF document text
- http://xn--h1aeekk.xn--p1ai/files/file/48312645262.pdfIn PDF document text
- https://kovtec.pl/eurostyl/photos/file/28726312608.pdfIn PDF document text
- https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/mozajorizibadutipakajez.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_off0000dc1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC1E	10900 bytes
SHA-256: `12dfd49f886e3e94cc53ef7bd6dad2864d301008dfc1fc5fa25fd8f586a8d565`
`font_01_sfnt_off0000f55b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF55B	20108 bytes
SHA-256: `31e311384b52f0e1a0d8afa5a9c33902c4c7660dd67b38a591748fa8c47db968`
`font_02_sfnt_off000129a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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