Malicious PDF — malware analysis report

Static analysis result for SHA-256 b528f5c71a63323f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 19:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 856e471f8e1d09fff8f8e89869265a79 SHA-1: 3f6ffb6cfcc311ca2e2a95f22c417b8b0afb53cc SHA-256: b528f5c71a63323f3faea74a2d300c1cfe194c74d59a3ed855d2aa436de041b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, including one that appears to be a redirector with a search term, and another pointing to a PDF file on a potentially compromised domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=watch+the+handmaid%27s+tale+season+1+online+free PDF link annotation
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/soremeganuponodoxej.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/fomovedevadudoriwux.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/77533626183.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/niwidopowibevi.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/28663445906.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/zijesunadixagiborejopitor.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/26924545409.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/34949721364.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f447561f2e---nowuwudivev.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gudodobesonetovibilixuz.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/nuzigomokiriwidafiwu.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/28661832896.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/89676706365.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/tinisub.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/41469823975.pdfIn PDF document text
    • https://digicpictures.com/downloads/roxezo.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80726416117.pdfIn PDF document text
    • https://bawauang.com/contents/files/40202347123.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109120226071195.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02ccc2585---futuriforabasej.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/80200772712.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/nodunewu.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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 10820 bytes
SHA-256: 449fa8affe21ecc1627847543840356ac3930a4076a13157f796f648a9d55d1f
font_01_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 17612 bytes
SHA-256: 1409b8c37a1caeafbf11781c0a9485e2bfaf459d3018cf020d166acd93a25748
font_02_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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