Malicious PDF — malware analysis report

Static analysis result for SHA-256 50deefac7905efcc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 07:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d4069b538d49c4e45f38bb541cfaaaec SHA-1: 8f38a13181d0bb69cd28438212356983631d1296 SHA-256: 50deefac7905efcc314def83b596c0fc29b2dc6ea66eefdbc6e9cdbc1e76f91e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/83928974922.pdf In PDF document text
    • http://climtech.com/files/files/poxafodebini.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/taxutumamobuguxifegiz.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/76916992652.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631485103.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/80698561850.pdfIn PDF document text
    • http://naso10.com/userData/board/file/ruxuxigugugedepefipidezix.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pinegof.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e599517878---kosipamaleturefebola.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/11175101722.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/78495308599.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/a4a1452c9726695e308839d2e909dc3e/29608127054.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/97716284458.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/67889559381.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/34704565543.pdfIn PDF document text
    • https://edex.co/userfiles/files/60705308499.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/07/kuveranulinipevitiridije.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210907091931.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6134C4D18A28E.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/12215197267.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/55218047641.pdfIn PDF document text
    • https://rm-parketi.si/uploads/munugirutesazusaxilubumiz.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/guzeti.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/vewovupulugedegedenedoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=firmware+redmi+note+7+miui+12PDF 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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 10580 bytes
SHA-256: 5e208c64fe9a2bee29925022b4ea2926ff3608e411f32c4b982b7ac21f1c14c1
font_01_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 17228 bytes
SHA-256: 825fd2773d640446432d9f9b0fe8e439d3b80515aa10015cf0e6f5ae442e9958
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1