Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a82a108ab693ae3…

MALICIOUS

PDF

64.0 KB Created: 2021-09-27 07:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c40689cb15f3cc4108a7013206f289bf SHA-1: 0ae1604c1a2ef31bade66d8057f4af1416a96a95 SHA-256: 1a82a108ab693ae3ce2b17940345971703879a06812736a34d3ad939781cace4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojanized PDF. The presence of a link farm heuristic further supports the idea that the PDF is designed to lead users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

Heuristics 5

  • 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
  • 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://goodmax.ru/i/files/wujef.pdf In PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/wufik.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/9798464741.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4621dd232---kenegerafosijawaj.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/14210097330.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/vuguritetexurolelativ.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/33117644552.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/jafofuke.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/21427454203.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/70502066303.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/90733446321.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/62688500282.pdfIn PDF document text
    • http://sinners-party.de/media/file/jolopebaxebara.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/48366724390.pdfIn PDF document text
    • https://limsurempat.com/contents/files/39532399018.pdfIn PDF document text
    • http://brenderup.ro/mm/file/36770703105.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614cedd1037e5---gagavanodasesotofupidi.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/pegitegiru.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/39127954142.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/88942314435.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/metudifuvotejowota.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/jonepufabuk.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/42938529269.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gula44rmv02qq5rn0iihku0285/98127760987.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/63269676493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=keygens+and+hacksPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16B 16132 bytes
SHA-256: 3ff52dc1604e143ba7cd0ce146ae46a3e6dd366c5f52a6d980a8241463f5a3dd
font_01_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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