PDF malware analysis — malicious · 99218436e3400934

MALICIOUS

PDF

71.3 KB Created: 2021-09-21 07:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 8fb1e6c29e8df0d2c03762c360206977 SHA-1: 445cc01e5371cc0865bf2e56e1194239b7460918 SHA-256: 99218436e34009341e8c5265d18d829ac06b48e708892e0d19649bb4f0b0ccc5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs pointing to disposable domains, consistent with a phishing or link farm attack. The PDF structure and embedded JavaScript suggest an attempt to redirect users to malicious websites or deliver further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=how+to+calculate+the+turning+point PDF link annotation
- https://oldd.adventurenetbg.com/userfiles/file/taratifigofa.pdfIn PDF document text
- http://xdata.pl/app/webroot/img/ckf/files/31749191247.pdfIn PDF document text
- http://kxnjl.com/userfiles/files/44246892892.pdfIn PDF document text
- https://anna-bel.com/app/webroot/files/userfiles/files/74843092561.pdfIn PDF document text
- https://pratham.one/file/25027853936.pdfIn PDF document text
- http://studiotecniconuti.it/userfiles/files/melagoxuxagi.pdfIn PDF document text
- http://uslugi-ogrodnicze.pl/pliki/File/59862065010.pdfIn PDF document text
- http://xn--365-pn7mwb654m2qn.com/ckupload/files/53646448567.pdfIn PDF document text
- http://alpinedelhi.com/userfiles/files/dumumaputeduxevazurevuz.pdfIn PDF document text
- http://mobiliteit.nu/files/9019337617.pdfIn PDF document text
- https://htapigroup3.com/contents/files/75338593861.pdfIn PDF document text
- https://defi128.phpascal.com/userfiles/files/22506280595.pdfIn PDF document text
- http://caudafotografia.com/userfiles/files/21144245409.pdfIn PDF document text
- http://datxeninhbinh.com/data/dulieu/files/nujigegaxitopugudomapeb.pdfIn PDF document text
- http://interroadholland.nl/userfiles/file/jawogulijidez.pdfIn PDF document text
- http://446888.top/userfiles/file/27450089400.pdfIn PDF document text
- https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/kuboteronugexarenipunit.pdfIn PDF document text
- http://z500.si/files/17370830817.pdfIn PDF document text
- http://prplus4u.com/ckupload/files/boxodol.pdfIn PDF document text
- http://epicridesnepal.com/files/sarigezoviz.pdfIn PDF document text
- http://newcityhk.com/userfiles/sezaxapu.pdfIn PDF document text
- https://campermagazine.tv/public/file/1418353325.pdfIn PDF document text
- http://szjwwj.com/userfiles/file///7229220531.pdfIn PDF document text
- https://uetty.xyz/js/ckfinder/userfiles/files/vufuleriv.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161484d07b1975---jikuzesuraxogej.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_off0000b809.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB809	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d01b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD01B	15520 bytes
SHA-256: `51e3e0d469ec766e291676922804dc6970d03d3e11d433b7a5cd6e0b85716ad3`
`font_02_sfnt_off0000f77f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF77F	10660 bytes
SHA-256: `9582f915d20bdf5dc3a8980c34bf84e9e7c3ef4deabeea98c769ef54a2fc1ed3`

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