Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c85bea34d6d648…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 07:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efaa7646802c0be8511ff71155b64fba SHA-1: 7840d45993da1cb9c37dd53fca8668a0e7e2ae82 SHA-256: c0c85bea34d6d64814e697991ff28a9de7a1d3b1139be8fc7150327ee154308c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external URIs, many pointing to disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gulfb2b.com/userfiles/file/55724340075.pdf In PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/merivug.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/48425853282.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/77286484923.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/43265391498.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/purilusolutuzedemoluw.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/tanorimobe.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/25871496342.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142226c91f45---mujazuzujov.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/wibezipedatukofupaxit.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/pulabodedivizizapige.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210905_121640.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/43602913445.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0d043abcb0678bd53c976deef8026647/vajuluvivi.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/potonador.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/97053800618.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/jozulofafobexafez.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/54695241541.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/winutexubutafamiliruwimef.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/monerewot.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210907123210.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jepotezaza.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/vaxibavonomewil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fast+and+furious+6+tamil+dubbed+movie+downloadPDF 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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 11052 bytes
SHA-256: 2da052e4cd1f926413820bd54246b336699a30147911a562fb2d13ae434f6095
font_01_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 18304 bytes
SHA-256: d02e26080b3f41336a703065e89d527d175f506330782a71789702556d913b47
font_02_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1