PDF malware analysis — malicious · c5924b5621b0b687

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 03:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 48a6e1b580a5457a487cf761556d88b3 SHA-1: 42de868b2b6557808c9878d2d5f35462c09e075f SHA-256: c5924b5621b0b6879c8e8d62919ae3750645c508ec528671632babbf35bde2aa

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with a critical heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicating it's a link farm on disposable hosting. An embedded JavaScript stream was also detected, which is likely used to redirect the user to one of the numerous external URLs found in the document. These URLs are likely part of a phishing or malware distribution campaign.

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://crewmak.ru/uplcv?utm_term=flesh+eater+courts+battletome+pdf PDF link annotation
- http://chrisdepanneservices.fr/Sites/cds/files/paruzis.pdfIn PDF document text
- https://clubberia.com/js/ckfinder/userfiles/files/26931887167.pdfIn PDF document text
- http://fbrasil.com/userfiles/file///15589974019.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138edd51069f---71229537216.pdfIn PDF document text
- http://narcisse.sk/editor_uploads/files/35489869388.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/43a7a78694dd4a0c5c7aab6015e0dde3/63432158235.pdfIn PDF document text
- https://linardi.ru/files/file/24139240018.pdfIn PDF document text
- http://www.cbs-emballages.com/upload/file/relimuruluvopak.pdfIn PDF document text
- http://levne-pohary.cz/UserFiles/File/mepesiwizikukimaku.pdfIn PDF document text
- https://turdv.ru/SITE/files/editor/file/vigovodinizonavanerovugi.pdfIn PDF document text
- http://lotusromeo.fr/app/webroot/files/userfiles/files/65441523032.pdfIn PDF document text
- http://honmamon-s.com/img_seminar/userfiles/file/varijezobaripiwufida.pdfIn PDF document text
- http://tongshengchem.com/ckfinder/userfiles/files/rifopujemamokipojaxogur.pdfIn PDF document text
- https://kudamatsu.org/userfiles/file/9172494644.pdfIn PDF document text
- https://plagij.at/ckfinder/userfiles/files/4970411938.pdfIn PDF document text
- http://risme.vn/files/90098440199.pdfIn PDF document text
- http://lrm.mcdonalds.ua/ckfinder/userfiles/files/87858499138.pdfIn PDF document text
- http://jamalcar.com/userfiles/file/mumese.pdfIn PDF document text
- http://arcomproltd.com/userfiles/file/59348844668.pdfIn PDF document text
- http://synergyproperty.com/images/files/63674076829.pdfIn PDF document text
- https://exam10.menapoint.com/app/webroot/upload/files/20859658130.pdfIn PDF document text
- https://smg.bid/ckfinder_userfiles/files/7087239330.pdfIn PDF document text
- http://creationart.hu/files/file/64288601567.pdfIn PDF document text
- http://woodbridgeabw.com/uploads/files/dibamodurofufuxenadi.pdfIn PDF document text
- http://fohow77.ru/upload/file/pogirobekupo.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_off0000c0cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0CB	10908 bytes
SHA-256: `a0a92ff980c3a8d075b83da61ec913830520aed46e52dc3507868eae56a15d56`
`font_01_sfnt_off0000d9d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9D7	17524 bytes
SHA-256: `57b5243b88bffc1023b33059d7dc6ea9ecc7b5bc72bbc33dafcabd29f93c5af4`
`font_02_sfnt_off000106f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106F5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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