PDF malware analysis — malicious · 5eea8f65d047319d

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 10:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: 908b0a37cc3449078ae6d47a0cf0bade SHA-1: 9eecfed50a09ab6d5a6f06296ce45bce7f782699 SHA-256: 5eea8f65d047319d2eec7b2b41f90267a80aa64ddec21ff36b5231c6967b3bed

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, such as the one found pointing to 'medvor.ru', which is characteristic of phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=facebook+hack+tool+apk PDF link annotation
- http://paintmaster.hu/js/ckfinder/userfiles/files/66511752870.pdfIn PDF document text
- http://www.rpv-drachten.nl/files/file/96080485993.pdfIn PDF document text
- http://studiofelician.com/userfiles/files/86986956745.pdfIn PDF document text
- http://autoscuolauniversale.it/userfiles/files/folavosodasakufezebam.pdfIn PDF document text
- https://bruceautoservice.com/files/file/nipazenawuwojilepik.pdfIn PDF document text
- https://avukat.dnsaktif.net/upload/files/sororoposizudivosame.pdfIn PDF document text
- https://vargyasnekonyveles.hu/kepek/other/file/pirazetebesemixetofibasim.pdfIn PDF document text
- https://whatproperty.ng/ckfinder/userfiles/files/86117473581.pdfIn PDF document text
- http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/33422696046.pdfIn PDF document text
- http://mrs-edu.com/sribati/editor/uploadfiles/6904523850.pdfIn PDF document text
- http://intertravel.hu/_user/file/99468963450.pdfIn PDF document text
- http://skonasystems.com/userfiles/file/14222465090.pdfIn PDF document text
- http://kidsjeodo.com/images/files/xedurodasasapalidigefar.pdfIn PDF document text
- https://firesystem.ro/imagini_ws/pupozituviwideko.pdfIn PDF document text
- https://drddvichitra.com/userfiles/file/23898557937.pdfIn PDF document text
- https://www.aicsmindia.org/ckfinder/userfiles/files/dikamumepaviveweretegese.pdfIn PDF document text
- https://greenways.at/userfiles/file/mekoxo.pdfIn PDF document text
- http://yves-segers.be/userfiles/files/waxigezexe.pdfIn PDF document text
- http://criollo-cocoa.com/userfiles/file/winakefo.pdfIn PDF document text
- http://fructusartis.com/i/File/67842159963.pdfIn PDF document text
- http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35149689861.pdfIn PDF document text
- https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/pigejejuke.pdfIn PDF document text
- http://techniq.ae/admin/uploadfiles/file/keravulad.pdfIn PDF document text
- https://haciendaloscipreses.cl/upload/file/xesumedamo.pdfIn PDF document text
- https://derechosenred.org/aym_image/files/39606990607.pdfIn PDF document text
- http://dailymaytrogiang.com/userfiles/files/61686107834.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_off0000da7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA7B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f292.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF292	10216 bytes
SHA-256: `5819cfa0a36218645b12841f2d3717f2d946740d4a1dabcf193318bb7dd821aa`
`font_02_sfnt_off00010968.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10968	17864 bytes
SHA-256: `246be9979895f9161bb952fa7d88f068fbbabdc85972bb947882bb8df434595a`

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