Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c57f149cbbbfebc…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 21:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f1456a4aa945c87e970a3d6f5480192 SHA-1: 8d6594f646cfdb0dbab7fff068bc05aeb50c9e41 SHA-256: 1c57f149cbbbfebc287d7236b552489ac0163c4930042266fbaa5cac456b752e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests these URLs are part of a link farm designed to obscure the true destination, a common tactic in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gkscam.com/userfiles/file/fozawixaj.pdf In PDF document text
    • https://stpm-sa.com/userfiles/file/zekagan.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/48756942402.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/70111552871.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/rewokogujidat.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/tevugipatatugefupupune.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/39177722372.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/29968965.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/96442578696.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/wisafe.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/69543747169.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/57530734136.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/fepazevuxukuporur.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/wenanogijokixirenezota.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/gimidebitilirojozututom.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/49281069035.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ec2b836fd---96011992420.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210909_164814.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/mubunonusane.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161494b4070461---14693118278.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/9883043532.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/befak.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/liwexosaniribamosoxemeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=service+timer+androidPDF 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_off0000b213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 10460 bytes
SHA-256: 5dadac293f1d586368ff4b103a3445594ad7b127d830e54f604e6ff5222600be
font_02_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 16740 bytes
SHA-256: bb8be29183f017cab7a41c63172fd8a5bfc2d5d32acda3c16e0a302ee1db0af1

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