Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcde047e0e4991b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 02:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4eeff9f93e1acf451d2ffa25f53da15b SHA-1: ea94fd05addd24e579fb9bd69c472ae29a819039 SHA-256: cfcde047e0e4991b83690861972a33fc29e052371f27d9d1cd236981e5cdcf06
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, many of which are likely disposable. This suggests the primary purpose is to redirect users to potentially malicious sites or to download further stages of malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atthaya.com/file_media/file_image/file/96946169072.pdf In PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/98550890839.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/nutajunakafaw.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/85446855621.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/jaxot.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210905095655.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1615077db5a5ab---julizoroselifekoseji.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/babefewulujijiwuj.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210926_C5383FEF18769B58.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/feraxabuxigin.pdfIn PDF document text
    • http://thevalleytrader.com/files/moxiburo.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/26551466180.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/23219093980.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109210616465206.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/86850191072.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/5037891875.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364df8d5939---29251425214.pdfIn PDF document text
    • http://machulski.com/public/file/lovinosizejesagok.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/61328461695.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/11454189126.pdfIn PDF document text
    • http://cartopack.com/Images/file/dosovaxa.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/wedetofexedanutemasazek.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/fidudetub.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/8610715512.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kedowatozaririnolivilu.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/gubiwomudu.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/19400081867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=film+john+wick+1+full+moviePDF 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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 10576 bytes
SHA-256: 91114b59cc80f5b67220f5c5efb46179471f1da96056f45f5e3ce4eeea8f67fa
font_02_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 15152 bytes
SHA-256: 463a338a85d90acd70748db2ba8c34a80f55f71cda89dd5db5f4e0fd93ab1a84