PDF malware analysis — malicious · c10a264ff61641fb

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 06:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 9f931f8acd4de6ced8eb42456c4bcbdc SHA-1: eb48c5e9fda5e3d42780c26e51e2cbf508c0f0b6 SHA-256: c10a264ff61641fbc523d64953ae4dc4d832ace96c1a5e8ce9e7c961a8e95b44

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also includes numerous external URIs, with one heuristic specifically flagging it as a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=100+meter+dash+game PDF link annotation
- https://suativisamsungtaihanoi.net/upload/files/7878904166.pdfIn PDF document text
- https://skvely-kup.cz/files/file/walikogegizemovewuna.pdfIn PDF document text
- http://kmbb.at/userfiles/file/99613060421.pdfIn PDF document text
- http://tetrafluoro.com/upload/files/92787064799.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613672056df6b---66331569331.pdfIn PDF document text
- https://traveletrust.com/basefile/traveletrustcom/files/44198914791.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ca56962b4---64830238520.pdfIn PDF document text
- https://ksmt.edu.np/assets/ckfinder/userfiles/files/96804290153.pdfIn PDF document text
- https://studiecarriere.it/uploads/file/21572277943.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/userfiles/file/venaki.pdfIn PDF document text
- http://svsteinfurth.de/radsportfiles/file/68213681059.pdfIn PDF document text
- http://ourdesign.hk/ckfinder/userfiles/files/95642227025.pdfIn PDF document text
- http://lukoilmarine.com/ckfinder/userfiles/files/16602355150.pdfIn PDF document text
- http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dikadop.pdfIn PDF document text
- http://tostonet.cl/ckfinder/userfiles/files/mivarukewejibux.pdfIn PDF document text
- http://aptekainternetowa.net/_mdm_apteki/file/vijuxelomusorifewesexol.pdfIn PDF document text
- http://dfzh.jmdftour.com/fckeditor/userimages/file/gisefaz.pdfIn PDF document text
- http://www.aaar.cat/assets/js/ckfinder/userfiles/files/71102826707.pdfIn PDF document text
- http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/pufanonigab.pdfIn PDF document text
- http://studiomanzetti.it/userfiles/files/kamumetikavuremafukesoxix.pdfIn PDF document text
- https://medbioplast.com/klucharnet/images/file/27584892624.pdfIn PDF document text
- http://jtg-antracyt.pl/files/file/fosijabamigorememaf.pdfIn PDF document text
- http://xsjprinter.com/d/files/90842570357.pdfIn PDF document text
- http://wildpflanzen-planung.de/file/funilogalodedorebisejoju.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_off0000d964.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD964	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f17b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF17B	10408 bytes
SHA-256: `e31602733c75ea0024af98dbd0c7c604808b0dd0b3d9e729bffb1079be865b98`
`font_02_sfnt_off000108e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108E1	17556 bytes
SHA-256: `8eb8bc0cd09afef34b13861395839373076e4dbcef38297fb833dddc214df108`

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