Malicious PDF — malware analysis report

Static analysis result for SHA-256 400cdf29054aede4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 19:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18559132ab5d22c5408860f92576e4d8 SHA-1: 45f6b7b227ac8bbff333e1a27e1003199f46377b SHA-256: 400cdf29054aede431e6b873d01234328e71640c152642554e844a905db28ebf
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aiming to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://pozitron-s.ru/userfiles/file/betepofewegeretabu.pdf In PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/64085548872.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/zodofugefodamed.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvawakoxovuse.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/tabevevezagatonesu.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/xegare.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-17/20210917170441531731.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/43876915734.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/jerumepilezimoxu.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/tevavuxokupel.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/04720cb825a33363778eb9a1d023e3c6/30256619245.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/fasifatosololut.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/19840030136.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/48292620280.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/32555611653.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nejogowomizuposaxe.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/98685699931.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/kinimuwuxilemenubej.pdfIn PDF document text
    • http://wwstationery.com/files/file/fosoxebewabapekox.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/87698480612.pdfIn PDF document text
    • http://novichiha.ru/pic/file/bojipigite.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/19557326670.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/79605576777.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614005e38cd6c---15137810474.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/pewalejabup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+android+pdf+book+readerPDF 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_off0000c003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 10732 bytes
SHA-256: eede3de1506cb0007dc59d6893447342016ba69b74fec3a1434b5016cf9cda7f
font_02_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 17136 bytes
SHA-256: 77e1054f55a7b6f9fb6132e2afedfd2b1264753bf7091386744c3d26c60d2ae4