Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b9e0d4401e13c1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 17:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68eb82384f275f2a3210671324b0418a SHA-1: 13268dbc1440811be151019aacfe063fe42fd269 SHA-256: b9b9e0d4401e13c11138f6139eee4c2292797a530ef7c0836975591320d44ba9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate attempt to create a large number of links on disposable domains, likely for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=mobile+legends+bang+bang+official PDF link annotation
    • http://kfoodntea.com/dataroom/file/xabuvusokulejamimalikixeg.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/4205809666.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/xanerunepobilozuz.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/nipevajimaxujetumub.pdfIn PDF document text
    • https://atiksigorta.com/files/saposizudimugaleremoteze.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/65447770934.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/17781570408.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/98647784762.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/14104015680.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/kojapokoruremarosekalusa.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/5947256350.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/16967442014.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/bolopamatolazejaxijevu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0ad212160050446b036af3213a15c620/pedexibegumibuvalinudinut.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/punuzesupuludasar.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/23793520199.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/93496789484.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54617711919.pdfIn PDF document text
    • https://kaparatt.com/images/File/26945356097.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/gititotasibakotuje.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/fukupok.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/vitopisevukora.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.

FilenameKindSourceSize
font_00_sfnt_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 10584 bytes
SHA-256: 98f2a6d5da8d5ae0c240d3934abc06761276ac154cfa76e151c0b76381f17202
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 18204 bytes
SHA-256: 986e71f511d16c5f10ef0175e68a07d93ea40874d02ea822849e20b00b50f000
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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