Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d308aad8360ee46…

MALICIOUS

PDF

94.9 KB Created: 2021-09-20 08:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 439dbc0a4c96892c88ff98389549c766 SHA-1: 6a1548e39c46c541d3bd80aa1af17331d4d9ef2a SHA-256: 5d308aad8360ee46632f8b587ad4bdbbdfa1c9847d4b0bb5b94f18ec3fccd597
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm strategy. The PDF contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially malicious websites. The presence of embedded JavaScript (T1059.007) further supports malicious intent, likely for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=the+kissing+booth+full+movie+in+tamil PDF link annotation
    • https://etravelbox.com/scgtest/team-explore/uploads/files/12850942228.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/nakuteminutunoxomuxorik.pdfIn PDF document text
    • https://gameclub.by/uploads/files/korisobodomesebirobul.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210916_994B66B801A3C54B.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/tosedemuzeta.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/94999746693.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161356c67c95eb---zumuvitarivojoxizutalet.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/suxutewikanutuwusevalute.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/jizefosezikafuvi.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/jukawibojukagavuwiwix.pdfIn PDF document text
    • http://zl369.net/userfiles/file/76457198939.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/41482201186.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/zejinojasiwajeniburovofot.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/9172717693.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/mavuxovafixonive.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/67037790154.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/17647946239.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1df597c9---24759643107.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/6082080945.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/3375334071.pdfIn PDF document text
    • https://ntc-container.com/upload/files/86290086738.pdfIn PDF document text
    • http://innotack.com/userfiles/file/dajakosek.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/91812307115.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/givewula.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gejaxadulufavujimunez.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_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 10920 bytes
SHA-256: 551611f72e46ac1ec0c9c631b1f96114e8eb90fff2f568fdbb41240121fbca48
font_01_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B9 21228 bytes
SHA-256: 441ea5017c886be1fe74ea7abf197efaf8b618f73f10d4eb8187773922e1f78f