PDF malware analysis — malicious · 37e3d7d181562d68

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 10:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 16635c34b275126927806346d888dcca SHA-1: f79f618d7335949c26cd5323e5eb4ec4600621e5 SHA-256: 37e3d7d181562d68d0c7b6cd3d4f8febf9d2ae4be4c3b932567caa89d0ae8fd4

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through the linked PDFs. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://hankilfood.com/userfiles/file/20210916142231.pdf In PDF document text
- http://www.udelimpa.es/ckfinder/userfiles/files/38858095036.pdfIn PDF document text
- https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/sukoxi.pdfIn PDF document text
- http://happyorderfood.com/uploads/files/37105024715.pdfIn PDF document text
- http://degrossier.nl/uploads/file/15312922210.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12fe049d6---kigadabiw.pdfIn PDF document text
- http://www.aamuhsv-madisonalumni.org/files/files/17617122858.pdfIn PDF document text
- https://tlkingatlan.hu/kepek/other/file/57632042596.pdfIn PDF document text
- http://xlpe.net/Images_upload/files/4554944732.pdfIn PDF document text
- https://vntdc.com/upload/fck/file/mubunajulajisowete.pdfIn PDF document text
- http://ottomaniantextile.com/userfiles/file/sabiwanexusive.pdfIn PDF document text
- http://gcoekmr.org/cukashmir/User_Files/imagefile/30377072217.pdfIn PDF document text
- http://xn--hh0b97d8is16e.com/userData/board/file/46288405193.pdfIn PDF document text
- https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/7120938216.pdfIn PDF document text
- http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23788085418.pdfIn PDF document text
- http://tdbm.vn/upload/files/jisaxefu.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400a57b5735---74721274188.pdfIn PDF document text
- http://gamjagolla.com/uploads/files/45731110279.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/zevenexobitareketif.pdfIn PDF document text
- https://actionsporting.com/userfiles/files/givadun.pdfIn PDF document text
- https://dondepodemosir.com/userfiles/file/xafanimawexipezome.pdfIn PDF document text
- http://thaicockstar.com/ckfinder/userfiles/files/towuweti.pdfIn PDF document text
- http://twinmd.ru/userfiles/file/54084647117.pdfIn PDF document text
- https://kultmotor.hu/images/files/bekusazigim.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+change+screenshot+settings+on+androidPDF 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_off0000e5ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5CA	10680 bytes
SHA-256: `ebc13e8d963c1c6305b2d2ce113446fb5e0342e19bf6fb3dcd14bdd6198a058e`
`font_01_sfnt_off0000fe12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE12	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011624.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11624	18148 bytes
SHA-256: `13ae715dfc8dc084d64143f335461452473a5e435a8fb5c54998b342cf3bba09`

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