Malicious PDF — malware analysis report

Static analysis result for SHA-256 be786e9263e6e2d5…

MALICIOUS

PDF

93.8 KB Created: 2021-09-23 18:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfaac2c98e1f51e96e1fb1f2efe6c5a6 SHA-1: 7e7ea728203b1d5203309cb4155c99505cc56aca SHA-256: be786e9263e6e2d581b8aee74d646daadc96c1afb4ee9b55018e0c43e3ad2ffc
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=photoshop+cs6+license+key', suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=photoshop+cs6+license+key PDF link annotation
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/73181418181.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/96843594556.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/dogewirirukux.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/78269012578.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/4215861263.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/pixowibabazex.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/tizisagezoxop.pdfIn PDF document text
    • http://paradoxine.com/upload/files/45292270075.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/76320974651.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/22583631517.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/77605500115.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/15883852618.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/64805415520.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kukajuravufawogutawofav.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/kanupomesefevo.pdfIn PDF document text
    • http://ymmicro.com/files/files/7653986153.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/nilur.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/tafuxiwakogalebilewum.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/57240662741.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/18740204495.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/mexejobisegux.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/44640451542.pdfIn PDF document text
    • https://avenue102.com/uploads/file/35188650845.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_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 18380 bytes
SHA-256: 2116664815202cec87c1ab7100a9aa5ef05754c4bb60762530c1425365a38365
font_01_sfnt_off000139d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F0 10584 bytes
SHA-256: 5665b4ed7c34f4e4f0658c09a383ed2d89ea63d96cc624a4853459b9db91bbb3

Open this report in the interactive analyzer, or submit your own file for analysis.