Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcede9d3a8776138…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 06:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a822ee6b4c9b020592b11c627ddf298c SHA-1: 1523a5f392db28e5c71f5e1970b27f64445ca79d SHA-256: dcede9d3a8776138c5195195ed79f5c75523b7eab210b6d10694f1851fd02008
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing activities. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://empezo.xyz/js/ckfinder/userfiles/files/sefejugopokezid.pdf In PDF document text
    • http://tieclangman.com/Images_upload/files/28474280638.pdfIn PDF document text
    • https://ewt.cz/res/file/39337934709.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-2/20210902134633325519.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/sokoki.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/7887390920.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/87468099544.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/tujagewuvezopulitefe.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/xabewusem.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/wutazavo.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/49138420399.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/8227212527.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/cbdd7d76692078df1a3ed80b95075e94/bemerorirujimezowifag.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/28414321286.pdfIn PDF document text
    • https://europartner2.pl/uploads/zasorugikisivogigalitew.pdfIn PDF document text
    • http://anindecor.pl/files/file/deruraluvafukanu.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/fefigetufutuxajokoneg.pdfIn PDF document text
    • http://elsped.hu/files/file/47488720927.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/74317837161.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/87329998329.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/jatuwadado.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3564d38c2322414e96eb32ed93ed05f9/35509551953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+wifi+password+hacker+app+for+androidPDF 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_off0000c0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E6 10800 bytes
SHA-256: d1239ccb89214dda8c5ace557a72eb6f9801d6a5b8f3ae21e8327251ac147dae
font_01_sfnt_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 17532 bytes
SHA-256: 46341a90fe1570b4218c186d4e68912a6ca102101c0fd6d920409e1368fd4ec8

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