Malicious PDF — malware analysis report

Static analysis result for SHA-256 96696af5819dd4ac…

MALICIOUS

PDF

94.4 KB Created: 2021-09-23 07:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 057e841518a1c0511f5cd40aa5b3b4e2 SHA-1: 6cb4d375e9773d8a6c6eae5b5c4592b3612c1c37 SHA-256: 96696af5819dd4ace7512bed773a45f12b08c056cf804610af57cbfdcfd02772
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external URLs, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://medvor.ru/uplcv?utm_term=a+game+of+thrones+read+online+free PDF link annotation
    • http://cheapstandard.com/uploads/files/37461073887.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/5784548484.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/70512700629.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/78082424545.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/61438434897.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/46174221703.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/90094137026.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/monulotizoduw.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r7d058tc25ts7m7jqjf5vfaivm/27833737386.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/22234334082.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/d0347da35cf7ccf088eef63582f3822c/66033989265.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/rumatikisovulaxegatowa.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/62405560165.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/50594634300.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/92892355634.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/vewesakedaf.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/51248008495.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/pebimetupugot.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/7821586811.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/59376643193.pdfIn PDF document text
    • http://greenld.com/userfiles/zusowusokusudu.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/91794574798.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/xugapefug.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_off00010933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 19192 bytes
SHA-256: d0c8c77079cb8d166d7b545681c6e900dd53a0828e6ebf3f8b14ccc7c346f979
font_01_sfnt_off00013b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15332 10780 bytes
SHA-256: 1f118f96e67b3121fb9aeaa47932e9a69af858dbc52d5b5529505846f1dcd31a