Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f09c3fbb138aee…

MALICIOUS

PDF

86.2 KB Created: 2021-09-24 08:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bb768aa13806c1420e2bc6d9765ce33 SHA-1: 73d7a17d84bd1e18e531ec52727e4f2b880cb07a SHA-256: 40f09c3fbb138aeea31443b75d2ddf35eb1f6f637d45a21c2126a2b7b94698a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://laborke.ru/uplcv?utm_term=things+to+do+in+vanilla+minecraft PDF link annotation
    • https://detmers-kontejner.hr/files/relunopikosatirazapiloxu.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/86506750325.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/54650965350.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/xakulite.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/gitijadixuxapa.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/69394547243.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/tefepumekupuson.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/61819302907.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/sofiberadulupavikewete.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109120848255185.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/tazipapurisufuxebib.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/zavezefu.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/96677159320.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/likoxufedazided.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/32505055110.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/25808683912.pdfIn PDF document text
    • http://telecycling.info/files/file/watopifopuzogedesa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/255c598d23e47730fba9e6b0ccfb28e8/47239127541.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xuremajexoxexolaw.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/jonoto.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/15288476545.pdfIn PDF document text
    • http://webursitet.org/Files/file/22925923681.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/gowul.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/danakexisuwegegimub.pdfIn PDF document text
    • 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_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 17476 bytes
SHA-256: 14687ec0b061da2d7b49cc16b2e337eb12fd1f84c6a5e9213e56c68d1d54100d
font_01_sfnt_off00011a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 10952 bytes
SHA-256: 915bb58b1477072346867a12fd02bbc1d1bff963ca30c82f36d26fff37c46985
font_02_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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