Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea12f0c01bee1518…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 12:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 005c6416857d5699bf7f797b8d47b65a SHA-1: d05cfe6c9314aa4a0ef2096ae30720fee5938acc SHA-256: ea12f0c01bee15188e452250b5a7e669de9ee8c4d5b1314133d0aa1822c22f9e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links pointing to disposable domains, indicating a link farm designed to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic for evading gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://starfoil-mail.nl/uploads/wysiwyg/pijarurigubopodunu.pdf In PDF document text
    • https://ambient-interier.cz/files/files/52894289260.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/53344233966.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/palibeputufebema.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/nezexenoxamugofat.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/12769263362.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/dikizub.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/11810725461.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/wamaraziligoju.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/wiviloxibadenaxuserave.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/gazebovivomamakezipebos.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/15165152914.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/naxet.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/fizamamezososok.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/pusewinerikedesipogufa.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/39079060809.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-10/20210910154331727863.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/bumifawovugazito.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161478661e9034---33912649549.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/lakediwo.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/rodajagolazun.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210917_FD90F2D48B5E6988.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68664352900.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/rifiverurujupiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=baixar+android+para+lgPDF 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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 18956 bytes
SHA-256: e3baf5f9ac21fe82e506cddbe39dfed57f6946906d23279406085794402af950
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10324 bytes
SHA-256: b9f454c4930f974bbfeb247ecb1b7c28e60a2b31051dd38f8b08827a77224b37
font_02_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1