Malicious PDF — malware analysis report

Static analysis result for SHA-256 504c5d77d6e063da…

MALICIOUS

PDF

73.1 KB Created: 2021-09-11 12:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9897898253f2fcb2d889a84d4b810574 SHA-1: 6eed3078f550a431df1af5bee3bb13649d0235c6 SHA-256: 504c5d77d6e063dad770565465f6c14fbd647ad0c53dc5fee7f7736307ec6a78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=wolf+of+wall+street+watch+123 PDF link annotation
    • http://96stone.ru/userfiles/file/5565616758.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/47618664051.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/puwepadupitepata.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/20806662236.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/88452350979.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/26790783140.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2ce1f714---jumobabigobimiwagewuxakuv.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/63289228689.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/satasizusezo.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/rijuzo.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/fepefufusowedixozide.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/monaxilemumanabapi.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/50889475395.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/xotazamixotudojivazekapir.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/93033558721.pdfIn PDF document text
    • http://geotersrl.it/file/54538644101.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/popamalizemelifese.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359e82bf2d2---memivopotirunafut.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/85635706697.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/rogipozuzexevufibaziti.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/30940013276.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_off0000ba1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1E 16844 bytes
SHA-256: 0edf4934fac0175a26a4318948d7302c26fa18cc2cb860b99b3614e941cd08d7
font_01_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 10660 bytes
SHA-256: e7a335273bc37f7d6e8cb7a504bee2b86584d837f8d57a2592b8153c7c5172d9
font_02_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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