Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40d2df84049eeff…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 15:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d87b32918f70ac9e88f08774f34da635 SHA-1: 1cada3a65f6b678282fdd6b3e06ee744a50b3c70 SHA-256: c40d2df84049eeff69db0b784aed3ddd0f181db647c68c38df2c7375351b2d50
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The presence of numerous external links, many on disposable hosting, suggests a link farm or phishing attempt. The embedded JavaScript stream is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=female+fight+squad+full+movie+watch+online PDF link annotation
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/91453665110.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/31664673455.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/21786452161.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/5757020276.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/niwusa.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/40962287717.pdfIn PDF document text
    • http://caythuocnam.org/images/files/24803350185.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///nodovubalorefuvetuvuw.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/82458603376.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/putipurepe.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/63624024713.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/96836634859.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/26487764214.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409fefb9a7f---22680271378.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210905083530.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/niwimowomajupevujudubalu.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/gejorokixor.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/wowifewadisimodimigowudo.pdfIn PDF document text
    • http://hk-keber.de/images/file/29512780818.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/13920392877.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/kidus.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16317716446813.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/97641969860.pdfIn PDF document text
    • http://safarang.com/basefile/files/wokaridemunox.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_off0000b15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15F 17140 bytes
SHA-256: b86304fb9a8a7a85bef5f55c578c7a94d98f19eaac7326992bef9020e021573d
font_01_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 11196 bytes
SHA-256: c71fd0e1a43427e63bb8b926926ab9e50f46b068bef3784b2a9347568c4814c3
font_02_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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