Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e95265a9c95a08b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 14:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6d72a7540376203106f2e779c777057 SHA-1: 8510f7f28cb488e2c38da657e418a49b19ee3a71 SHA-256: 4e95265a9c95a08b48fdec104bb75f16dd86230ee930c6a7f4270d9097a3540d
134 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 exploiting vulnerabilities or delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, likely to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/78282903741.pdf In PDF document text
    • http://cnokorea.com/userfiles/file/wegulikuxosipewiwo.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902172232.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/nibutevipudigirazuxofu.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/35731230732.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/66101866425.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/vafubepazol.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/nirurisakaxelox.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/lobixatugepijoxevejuse.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613346ed9f59d---xijefom.pdfIn PDF document text
    • http://lamay.de/userfiles/file/52537327896.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/87909609084.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/57023963444.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/934454887.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/95de53482e462a7bed91062ced828d18/8147814808.pdfIn PDF document text
    • http://wwsm-us.com/files/file/10742418911.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/wewiwuxisiboge.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/bikininilejagesavamib.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/2021915155799316.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/64270909826.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/fadik.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/16004941892.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38934528613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=john+wick+chapter+3+free+streamingPDF 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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 18044 bytes
SHA-256: 799200ce969f645dda10796c77feb16922d5719a677c0cf454aa068f6289d88f
font_02_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 11224 bytes
SHA-256: f7b7eadb279361085077c499ab75fa1bfaa1ef49e52c7ed66d6ece866e4d8ff4

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