Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c067896e0300af1…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 10:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f41877b70f059da618683343a3d4b93f SHA-1: 993529a08ed4a04a8f3ddee783e4aa26c7f2ecca SHA-256: 8c067896e0300af1a82555302b3a1580af8d59662f9ac8a6d99db0cfd71d0124
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://newkontakt.ru/userfiles/images/file/42014305188.pdf In PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/nuxomiwegafudodakebasij.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/1805144938.pdfIn PDF document text
    • http://hla.vn/upload/files/33505492235.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/8785735876.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/baxasa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136035926346---tijagego.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/zorixusugakigedajofagaxe.pdfIn PDF document text
    • https://onlinendttraining.com/files/86664618189.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/49505224364.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/3925526577.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5a6518893b31ed133c5e2f3a37982dcb/99538709278.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/wagoxajofila.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210901185929.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/tobixojelulenemamukuxub.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/65075251008.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/donule.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/gabumemi.pdfIn PDF document text
    • http://youil.org/userData/board/file/dowuturabufirofajasav.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/4003775796.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/6353008463.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/14550962144.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/3059687545.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/wubajetejifabuto.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/risofarevesejaxafek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=c%C3%A1ch+t%E1%BA%A3i+game+mi%E1%BB%85n+ph%C3%AD+cho+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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 31216 bytes
SHA-256: 3fc2ef0cd647028a051525319dd6c668aa1fd7674f764d0236913ae778d12211
font_01_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 11528 bytes
SHA-256: 63189e006c2da186022cec5320af88ad5dc4c66245f81d551a03e6401d7a0942
font_02_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1