Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ba9d2603c3eeee…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 22:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f89133d66fba917ba0dcd356aa3c4055 SHA-1: 6dffd06fb7ab8a3592fc7d943ee7286a3eead8dc SHA-256: 65ba9d2603c3eeeeb86fb2eb72754c97903a499c57bc873e74be0d2653274221
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to disposable domains, which is characteristic of a link farm designed to obscure the true destination. The presence of embedded JavaScript further suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://taiwan-tiaya.com/upload/tiaya_official/files/15180052484.pdf In PDF document text
    • http://elitsatodorova.com/uploadfiles/file/57883991101.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/68675641300.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/goxapagududadija.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/farofagirumugubewu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2t3iuoi6gs3h3aqjqlfde946j3/walana.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/wototodupobawogalipu.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/pejezozo.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/tolarewateluvuwo.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/59073316672.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/18721683575.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/jibologijozipuvavagikoba.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/97423312001.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/nivokexezuzaborimifuxumox.pdfIn PDF document text
    • http://surestegc.org/documentos/file/69196037810.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/20887726050.pdfIn PDF document text
    • https://airxps.com/userfiles/files/velisidotixunaxofivul.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/sedezaxilakaxokotagulimut.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109100318316805.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/tuxigetupireriwoxegowafa.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/xiwilaxumudidu.pdfIn PDF document text
    • http://simoncaulkin.com/images/77081231716.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/71847303416.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nutid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548953269f---todabuxijelekamov.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/14639138273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=english+vinglish+full+movie+downloadPDF 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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 10840 bytes
SHA-256: 902aec9e16713d57049ec12fff2e8a81ee222e5e04cff91897eda3b4153dcfc1
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 17236 bytes
SHA-256: a31e14994976422c2f3158037479d5bf48af09c66cbb25a891faba4a3ef2b782