Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8c9a72466dd39e…

MALICIOUS

PDF

78.4 KB Created: 2021-10-06 09:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c89467b59b97ad0dad902ef34215f80 SHA-1: a7b430fbd9c5aed58102b20e2159da5952e84be6 SHA-256: ac8c9a72466dd39ed9d3d4f63709e4d3e9e7edd54d230efb085f1fb04d47530d
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which are linked to disposable hosting and appear to be part of a link farm, suggests an attempt to redirect users to malicious sites or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=minions+movie+torrent+magnet PDF link annotation
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/gasujufamokenos.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/44760965725.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/gokolug.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/gaxove.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/fevekinanurum.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/gebofarosokisuziwexogu.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/moturizolomugubezomedaxu.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kedafasibotorigadimo.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/67549882596.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/saxiwefiwavuxizikawejiwa.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/4187730267.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/lepajezixilikes.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/xojogirokuvezov.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/27772705487.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/wakevasarivesatofu.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/kixive.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/44bec97e403cafb304e5a3aec079a021/97725593354.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/85015482554.pdfIn PDF document text
    • http://marketingnews.fr/images/file/37383983553.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/vifeludajemejewetaso.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/61969433452.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6be755d94dbde05479957521b0433fbc/14389692924.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/11778203083.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/72281075162.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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 10464 bytes
SHA-256: 10ede561c19075fcecc49292888135988a72945090bd67c3e213ea0f1873c655
font_01_sfnt_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 18024 bytes
SHA-256: 21d282916c1f0c832c6e2a910a023035417809e8b139b95445fb087e84fed3a6