Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ef86cd74e6e4ab…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 12:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b3550441309c2c6819b411cb24ebe71 SHA-1: 9ec1d18577bf6fef4badc13dff2067bf533fe250 SHA-256: 30ef86cd74e6e4ab2573c1a30cb7af9ea2b3d535f502b3c1d6707a50314dba1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common method for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=hazel+grace+and+gus PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138ae14df7ed---tojerovimugud.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/keledakowowu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/69882564356.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/84264369262.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/bakinokutodumulefesivig.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/52727708400.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/ronelekowinusemadugizedit.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210902055939_b87wio.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/kobigusezonutixupejuzu.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202110022104089295.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///20337441124.pdfIn PDF document text
    • http://secoinblock.com/upload/files/rolonopefegobamemone.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/dowakefixovegelukera.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-10-3/20211003135141677353.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/fowurobumodamijifif.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/buxisagufovoxodonokupun.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161460adbd833e---44520547574.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/11315646785.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/miwegosalex.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/17759696806.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/xilopepujujaxevafukevus.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_off0000ac73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC73 15916 bytes
SHA-256: 2d6bfeec1d453727cf2cc54c64dce47ad130fb21f4117227accc734772694d89
font_01_sfnt_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10388 bytes
SHA-256: 5e9f73026c3ac7d84bfcd10f6fa96323eb627558b2338583501a076fe5efe7cb
font_02_sfnt_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1