Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee038f99c41d90da…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 15:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be87cef1351f15190cd0456605df2e5a SHA-1: 27ec78f30ee49b337ad88a7f46b3cee60a131679 SHA-256: ee038f99c41d90da3b54487a39a8dc8a897ba298b57e1421a47a1913deb6cdbf
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, suggesting a link farm designed to obscure the true destination. The presence of a 'download button' heuristic further supports the phishing lure. ClamAV detection and ML classification confirm the malicious nature, indicating the PDF is likely a phishing document attempting to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lepetitjaunais.com/userfiles/file/57232337927.pdf In PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/xupusaluxakololos.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/dovuwotojekiteta.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/zevutiluwalurinab.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/bilobu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/13649896106.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/61737233753.pdfIn PDF document text
    • https://mar3ol.com/Files/files/zavawivono.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/wefutefurad.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///topakiwilojuw.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gijififemoburinej.pdfIn PDF document text
    • http://humanlitech.com/files/files/gijaxodemujimomeder.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/69533889673.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/julonosebofanewosidobu.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/xakegijogedogiva.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/88734855851.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/refasoxibomez.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/divuvavefawibulinalogafu.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/pevabejinenexiwivana.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/vebojomedamupomo.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/tedemazifinovokoligofose.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/pivokimedapag.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365a0c54ce2---piwobenapanerovikimupa.pdfIn PDF document text
    • http://smogy.ru/files/files/xamosizadoseril.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/dakogijam.pdfIn PDF document text
    • http://potlista.com/file/files/74533224328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cara+bermain+ppsspp+di+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_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 10580 bytes
SHA-256: 4b3c3b413f6d166514e0c91385423240f92463525063f70c6cba8326e323b5b5
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 17648 bytes
SHA-256: 53d36dba9247fbdcbefd74e146dd516a44ea7f2e74471a9011cf9d8f922708ed
font_02_sfnt_off00011b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1