Malicious PDF — malware analysis report

Static analysis result for SHA-256 469927aa5c7d17e6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 02:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 231d509065f2291965a7a52b156d48fd SHA-1: 9f05380c8b8eb5c595cf6824088d4eb0330167a9 SHA-256: 469927aa5c7d17e632939b7a6ccdbe888ca6c42c6ac77b97fc5b79e628732467
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm and a potential download lure, suggesting an attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://maria-galland.ru/files/file/91084211876.pdf In PDF document text
    • http://pvvc.cz/files/87367908213.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/15745185300.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/9536500117.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/39326092938.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/nifidajezinekerolovisivet.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/16492506364.pdfIn PDF document text
    • http://dsagco.com/Upload/file/bevubipanimes.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/61743513186.pdfIn PDF document text
    • http://quranday.org/userfiles/file/noxoxakoxuvaru.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/kepilorobaxopisisasiviw.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/42884256579.pdfIn PDF document text
    • http://creationart.hu/files/file/60095448585.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nemapobiragamaxafa.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/46169650602.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/vuzelesujojebawafebuwi.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/14446891101.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/rizagelamosukovizusapego.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/80994371603.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210904231142.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210908024531.pdfIn PDF document text
    • https://mashura.co/userfiles/files/webedotigifegetizanizo.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/revelamagunasifetukej.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210901084946534439zpn8nu.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/sowofinisiwovede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sniper+3d+assassin+hack+apkPDF 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_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 10684 bytes
SHA-256: 06d732162bbefd013ced0583d710b2d2965a3d19b039684ebb645a7a9e269a71
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 17460 bytes
SHA-256: d6ee0c8cc3937ae36d4b1ec88f5b9090388d77203b37141ab297c0e9095e0ae8
font_02_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1