Malicious PDF — malware analysis report

Static analysis result for SHA-256 593f38721740db8a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 15:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 808c43b55b5b3d7380cdeb52ebd0676d SHA-1: e23d1976d6268574639537f94db33bab9aa154ce SHA-256: 593f38721740db8ac7aee20758b9bb30c2470bbc37cc09beae85bb07887da590
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host a large number of links, likely for malicious SEO or to distribute further payloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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
  • 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 http://2478.ru/admin/ckfinder/userfiles/files/47541097520.pdf In PDF document text
    • http://odumakus.com/uploads/files/rodafadage.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/likinuluzumekis.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/34195035780.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/12728066367.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/bonetimaxufof.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/galewapufedokitowiwalelux.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613665466047e---nogifunodonutasasasogob.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/vijonadidixiwudesipil.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/3217985217.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/sukejigoru.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/tiworojo.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/taneb.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096687b02f---sidugetafojugifup.pdfIn PDF document text
    • https://kulittelor.com/contents/files/1182638073.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/jakaxomere.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/watokawuni.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/gelibo.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/10027424564.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/divamuvozuremetu.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/nixufarewu.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/47140436482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cafe+video+call+mod+apkPDF 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_off0000c5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 10500 bytes
SHA-256: 1175f38ceac77e22cd26dd2b0681d88b548cf2974773eba2b0b6f44a31dc27fa
font_02_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 18228 bytes
SHA-256: 38e4d0ee89e8e592f6fd26b7b7c484c47ef9e0b95fff531d9450f4b5b33c339d

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