Malicious PDF — malware analysis report

Static analysis result for SHA-256 999ebf146903f027…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 05:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 245bbcafe4904027452aeee538af6c11 SHA-1: f79aa159bcfdc27a3ef92cf26025d283af24f77f SHA-256: 999ebf146903f0277ab2ff375aa7fe7ae3dfd4f3eda4945ec4234cf433bf6c13
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://szjglaw.com/uploadfile/file/2021091417453773499.pdf In PDF document text
    • http://trumoi-khutrung.com/upload/files/3898248777.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/82518952117.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/77080330680.pdfIn PDF document text
    • http://irths.com/upload_files/files/35551962088.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/watujizosifasebasovam.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/40152425930.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/wenulewefaxemigej.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/tiziluloluka.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/nivibunubigasimadafavunu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161448f335f388---23477947902.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/3020476289.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/38875205593.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/78858179530.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/11312532625.pdfIn PDF document text
    • http://midel.me/userfiles/file/71972622374.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/98802006695.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/49043823494.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/83354588411.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/fikaw.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lopap.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/74868487789.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/kuguvir.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/57588054374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+camera+as+webcam+usbPDF 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_off0000ca62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 10696 bytes
SHA-256: d67606ade6d291d09f38101a2bc036bafaa83181bdd3e3eac90e8bcc106cf8f2
font_01_sfnt_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 17052 bytes
SHA-256: e367c91f0248832e6f80db58d4999ce16e2cb81f4bfcdb8e6eef8f0931087236

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