Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c0ef8ba0b074e7…

MALICIOUS

PDF

137.3 KB Created: 2021-09-17 13:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9036053b890f919aeb07d35f12055335 SHA-1: f9b31f7db0f6436eb8f9eb8121da461c682de716 SHA-256: b6c0ef8ba0b074e721285438d36cb59afd3efa042af26f9f644d86dcf48c002a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/27158564408.pdf
    • http://lor-rostov.su/userfiles/files/pebirogiwidu.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/xupusaluxakololos.pdf
    • http://phutunggiahungoto.com/uploads/files/libemuvepiluzirusavu.pdf
    • https://yenhuy.vn/upload/files/79558914811.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fef23f3c2479ac93be55382e77529b60/80275756200.pdf
    • http://inistor.com/ufiles/files/18386288330.pdf
    • http://frezerovka.by/images/fxeditor/file/fazeburifalawefakegated.pdf
    • https://millersexpress.com/userfiles/file/2031430863.pdf
    • http://purepassion.pl/userfiles/file/45706332463.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/finobite.pdf
    • http://2m-m.eu/userfiles/files/lemivimikedopawik.pdf
    • https://sssmri.com/ckfinder/userfiles/files/lujuvugewumarigi.pdf
    • http://zopos.zohukum.com/ckfinder/userfiles/files/pagitasabekura.pdf
    • http://murito.fr/ckfinder/userfiles/files/48894840304.pdf
    • http://cpviettin.com/upload/files/mosarunidirofisipepo.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/11471454327.pdf
    • https://traffictkt.com/viking1/uploads/files/11398210377.pdf
    • http://kant21.com/userData/board/file/13736854646.pdf
    • https://vieclamlaocai.vn/webroot/img/files/74134047040.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/63992992045.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zorumopusubemikekak.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/53756878984.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+smallest+composite
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b1b1.bin
94786a863c778eb03d6a2b70b2e320452160b5b1f105668982bab422171d44a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1B1 10400 bytes
font_01_sfnt_off0001c942.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C942 16792 bytes
font_02_sfnt_off0001e154.bin
cb1b9b64702f26676f6a276978b5a4403e22eefc0d75af38212fc59fd7154790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E154 20420 bytes

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