Malicious PDF — malware analysis report

Static analysis result for SHA-256 354fa65f52af6d66…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 13:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7717c58e791410aecc4db63ea806b0e9 SHA-1: 2716a5b1b49689f42b94be7369b7285920480bec SHA-256: 354fa65f52af6d6606dfa36bd13ebca38ecced50674f0553fbeb6c8547aeb86d
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content via the deceptive links. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/30627521105.pdf In PDF document text
    • https://profix.fr/ckfinder/userfiles/files/79047803867.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/dipafowaxep.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/71151512422.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/91449031651.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/67981619586.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/61266652207.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/xugitidi.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/27669225746.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/bigizupil.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/linojoludulegab.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/pezewubebetonobi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d03bb728f---37475623290.pdfIn PDF document text
    • http://katela.net/userData/board/file/rurotitubigepomut.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/74627557920.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/23273781085.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/lezisepavikutarovudi.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/19387750223.pdfIn PDF document text
    • https://stormester.no/files/file/45054108969.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/vemupimuxifimaxalogobeg.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/suribabubup.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/44324306311.pdfIn PDF document text
    • http://yejida.com/userfiles/file/22026156119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fate+the+winx+saga+downloadPDF 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_off0000cddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 18660 bytes
SHA-256: 50803a9ab1617eba721b508722f74a8c4b58feca7f6913b0cdf58a867b654996
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 10592 bytes
SHA-256: 1f230af87e68eeda8b80a01712f7c7221d08075ef9437237eef35907a0dedffe
font_02_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1