Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6ecab15ac8244a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 01:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2d95c10a9f912e354db6d9a4c8030ab SHA-1: 7341585c96cfc942324689d6eed0043f2629b46d SHA-256: 8b6ecab15ac8244a5800910a4522e8cd37a7755f00a406dfde1738a290db5d62
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a likely phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to obscure the true destination. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=the+first+and+last+freedom+krishnamurti+pdf PDF link annotation
    • http://hostingureitings.lv/uploads/userfiles/files/48988266707.pdfIn PDF document text
    • http://drironcat.com/images/file/naronisujudovo.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/kefizanufagiwisuratadel.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/14389016006.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210906_085955.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210921_25BF3068DD49BF0B.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/jataviwoluv.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/13068688543.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/13588140767.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/rusajumita.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/66898581493.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/60557563393.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/24153205714.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/gevomukixovog.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/659d90392cf1d8c768111186cc576997/rejatowamudarozeloseva.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/23743695733.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/rivered.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/3312513248.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/ruboxatolela.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zufawoziguwopajoviviluk.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/29201009131.pdfIn PDF document text
    • http://tid.vn/upload/files/pedifutivil.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140feda9e624---kanedepefojesagip.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zisabojovimuwawadu.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/43087562214.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/17656924732.pdfIn PDF document text
    • http://npas.ru/pic/file/40753289662.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/65049492609.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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 10916 bytes
SHA-256: 5bc8914c722f57ae0fbe6b758a404bed993fdfe4caf0f94705ce73e1bcf2518a
font_01_sfnt_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 15244 bytes
SHA-256: f87d6ebb650bee044c50beea6baa72694dcf7ef13c0db46825f999db3fd6d6c3
font_02_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1