PDF malware analysis — malicious · 5e6b5a3804e95851

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 16:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 944ac87a049a4286df31dfb5b5b9ac47 SHA-1: 3da25d5acdadcf6a1fe83b1fa7d63d01c49e61c1 SHA-256: 5e6b5a3804e958518b22545e059e16171cc3f452faa4f722c81c819f9be44624

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 hosted on potentially disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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://sherwoodchamber.org/ckfinder/userfiles/files/zejijusifavamazo.pdf In PDF document text
- http://mynotary.ca/sites/all/sites/mynotary.ca/files/51372762500.pdfIn PDF document text
- http://omegapizza.net/uploads/files/46844941649.pdfIn PDF document text
- https://reparation-mobile.net/userfiles/file/92856988532.pdfIn PDF document text
- http://dichvuhieuchuan.com/upload/files/pikisakexafubobizar.pdfIn PDF document text
- https://harshahometutors.com/uniformkontakt/userfiles/image/files/gabuzavemelunuju.pdfIn PDF document text
- http://onyx-innovations.com/assets/ckfinder/userfiles/files/72652246017.pdfIn PDF document text
- http://sparan-art.ru/ckfinder/userfiles/files/71620152193.pdfIn PDF document text
- https://tunguoilon.tunhua.vn/ipp/images/uploads/files/47235683245.pdfIn PDF document text
- https://towa-aaa.jp/userfiles/file/98709541583.pdfIn PDF document text
- http://theaterbuehne-schwandorf.de/userfiles/file/pudatapaxenuvesaxaxupa.pdfIn PDF document text
- http://md-servicios.com/userfiles/file/18290218350.pdfIn PDF document text
- https://www.bankkartya.hu/js/ckfinder/userfiles/files/gisoj.pdfIn PDF document text
- http://elisa5888.com/shopadmin/upload/files/lugigozufakuvosuxa.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7b8ca291---zafeti.pdfIn PDF document text
- http://appinaris.net/ckfinder/userfiles/publics/files/xurifibanugalevodumisalek.pdfIn PDF document text
- https://bedandbreakfastholten.nl/userfiles/file/49851856297.pdfIn PDF document text
- http://dailitara.lt/bites/uploads/file/13990912090.pdfIn PDF document text
- http://mosjob.ru/images/file/fofilurelamotubo.pdfIn PDF document text
- https://bushregenerators.info/userfiles/files/bozobixuxaxudeluwimu.pdfIn PDF document text
- https://akvaguru.hu/user/file/54675953249.pdfIn PDF document text
- https://stpm-sa.com/userfiles/file/26450039544.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=covet+fashion+mod+apk+2021PDF link annotation
- 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_off0000eac8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAC8	18848 bytes
SHA-256: `51b31a439f1e627b927531dfcb4e448c5b4ba80a0e0ef27106f4c28b5076d57f`
`font_01_sfnt_off00011c3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C3A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013451.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13451	11100 bytes
SHA-256: `334ba684e3ba4a91cdff0d2ae16fe1c5d4c30fb9754404724825dcb5c10d1bb5`

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