PDF malware analysis — malicious · ba31a9b96595bd44

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 17:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c526db5bfea95f13c88634f4b4035fbd SHA-1: 15f1eede9369c7fc7e1d5eb2e685097a5385328d SHA-256: ba31a9b96595bd443dc5bfaf575811936857c6d71ad3d701bbaf1e71cfb454f6

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the malicious links or perform further actions upon visiting them.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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 http://cudicio.it/images/file/97420466648.pdf In PDF document text
- http://landroverbh.com/ckfinder/userfiles/files/52472023248.pdfIn PDF document text
- https://zilalcooling.com/other_files/File/sepumixofibikaxuvogudaro.pdfIn PDF document text
- http://northmarking.com/userfiles/files/satixixitojisapuk.pdfIn PDF document text
- http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/78988372814.pdfIn PDF document text
- http://tubelessons.net/cms_images/file/5009063505.pdfIn PDF document text
- http://park-seversk.ru/other/js/ckfinder/userfiles/files/pezalosipitiwowanuvuvadi.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338d3b55eed---58107491453.pdfIn PDF document text
- https://limsurdua.com/contents/files/xevijim.pdfIn PDF document text
- https://borgopitti.it/userfiles/file/muzifibu.pdfIn PDF document text
- https://coastalholidayproperty.com/ckfinder/userfiles/files/9212785939.pdfIn PDF document text
- http://geriatriccarenewjersey.com/userfiles/files/92865072873.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba10ad686---golokafebatajofow.pdfIn PDF document text
- http://ck-buhgalter.ru/userfiles/file/dakamopejozesizode.pdfIn PDF document text
- http://njbeihang.com/uploadfile/file///2021090515273596.pdfIn PDF document text
- http://paradisetourkorea.com/FileData/ckfinder/files/20210910_BA5A3DDD39F611D3.pdfIn PDF document text
- https://agape4u.org/userfiles/file/xexire.pdfIn PDF document text
- http://clinicaveterinariabilancino.it/userfiles/files/demamakefabubajubazil.pdfIn PDF document text
- http://gayaarchi.com/userfiles/file/20210910155109.pdfIn PDF document text
- http://www.koeru.eu/failid/file/zuzulisomozojemipatowet.pdfIn PDF document text
- http://movitecnic.fr/ressource/site-image/files/budumokik.pdfIn PDF document text
- http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijemadakejezofano.pdfIn PDF document text
- http://bushurov.ru/images/files/79777343884.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=clash+of+clans+hack+version+download+town+hall+12PDF 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_off0000cd17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD17	11020 bytes
SHA-256: `76007d344c77acd7edf9e25a10edf1b0c6bea09afdfb075be7b50e8a9c0b36ae`
`font_01_sfnt_off0000e6d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6D9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000feeb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEEB	17328 bytes
SHA-256: `950ef3c963c2dc44e98c2f94536c33a40622e6110641f920bdda79825e9268b8`

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