Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0154a86682c36b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 21:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b3ce75c83ed0c41feea5727dd677a12 SHA-1: af5105b5b4c4cf492eac74c027a46fb02bb55a6e SHA-256: bc0154a86682c36be67a95b8e9d8934a3b94e5d0b1853116f922be1ae7dde959
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to external domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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.
  • 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://www.cascatai.com.br/ckfinder/userfiles/files/31834352438.pdf In PDF document text
    • https://termofriz.rs/files/96551719435.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0838143001631700613.pdfIn PDF document text
    • http://anm-av.de/uploads/files/27295515349.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/kixisodanodaj.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/80746172026.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/gogegijazufikuf.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/36900790926.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109150125479888.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/xazejebevinuwudejususajil.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7bfe4fba---setadizurazupawa.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/demewuterugaxu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/49496291664.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/49762606135.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/31827422133.pdfIn PDF document text
    • http://origo.ws/userfiles/file/fekejowawekaxe.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/10431818832.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/89785511461.pdfIn PDF document text
    • https://protrialse.eu/files/files/1375552273.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wivufuduvurasilomasaziw.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/5073316774.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/26301212354.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/luxawunuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=eliminar+musica+duplicada+androidPDF link annotation
    • 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_off0000cd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 18192 bytes
SHA-256: ef7a0ba7e192acc9a113508c21ce4951edcdc8438dfd35acb73e27c9909f56b6
font_02_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 10528 bytes
SHA-256: 9f4d2fbde732add19f5b9e91d76121357c80da318faaa7cb4a91092a7a2f826c

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