Malicious PDF — malware analysis report

Static analysis result for SHA-256 738e53af44627901…

MALICIOUS

PDF

80.5 KB Created: 2021-10-10 00:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 008e9bb5acad6dafedbe22ab6338e621 SHA-1: e5588725a325ac81662823da3586a8e3f84236df SHA-256: 738e53af446279013d9f702b747297dc0d52f2df06b8596cc9b194e88e69793a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with a critical ClamAV detection of 'Pdf.Phishing.Trojan'. It contains an embedded JavaScript stream and a large number of external URLs, many of which are likely part of a link farm designed to obscure the true destination. The presence of JavaScript suggests an attempt to execute code, likely to download a second-stage payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://atputasbazes.lv/images/userfiles/files/32996527990.pdf In PDF document text
    • http://hnspkjx.com/d/files/novobi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/7501121767.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sodotozositiweneku.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd0370282---nigekazajokagenifegas.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/24281167991.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/wedapolazi.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/lizazixexijiwabojeduza.pdfIn PDF document text
    • https://adikkedua.com/contents/files/69123777480.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/nujuxo.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/31119126861.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136279589332---zepivipov.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/fadixowexepen.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/devoxibuxebudov.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/75115134660.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/vilezunexano.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/binit.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/vowufogebebemawutel.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/nofowozaz.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20211007010703.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/67690944980.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/bugifogotupo.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/65034256782.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/bezosifom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chemical+structure+of+disaccharidesPDF 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_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 17756 bytes
SHA-256: 77ccae2183fa01f612854a66746a24941c6e946cd327733e0bccf20daa8378bf
font_01_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 10768 bytes
SHA-256: 13dd5fb541c517c09de5f28f0dcc36125429a7d9c6d305f14e97ad8338c4cf15