Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f4883496eb1c08…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 19:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52a64f43f751f57254a714294b9c8cf8 SHA-1: 1f2ff92ec0f38541a9d575e2540ee3d60bed53c0 SHA-256: 21f4883496eb1c080eef521279b200de32d9485f9184e0a48038dff52672e822
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, common in phishing or malware distribution schemes. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=how+to+create+video+player+in+android+studio PDF link annotation
    • http://bronia.org/userfiles/file/somonet.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/55398104549.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/5462887566a9a6f8024d23397f256ca0/37531327333.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091319041373499.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9b586bb4bc72bbfb88098a48f0640583/benisetobeveko.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/32033109100.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fizazaluviped.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/80223311186.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lovopafix.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/98775174926.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/25511134480.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/72233433691.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/jizisu.pdfIn PDF document text
    • http://js-space.de/userfiles/file/tigodebutekov.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/56161503062.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/zigezudoz.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_off0000cb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 10864 bytes
SHA-256: cdf10f47cd82bf252bff820f4008e00b8d9984139171db6295d4394cb94b7725
font_02_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 17964 bytes
SHA-256: 99e44e38711fd479caa884395652692fb8e5e91af1c0d112cfb3375a82c81f60

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