Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c7f216613ee9d1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 00:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15622a2bbc316e09a64e1e0327639472 SHA-1: 02e037bcf71142f30ed6281fff78ab835dd98bd0 SHA-256: 10c7f216613ee9d1709fda55a4335d3c1807207402b83a04022cd71a343955cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://daoltrading.com/userData/board/file/loxadategulidiv.pdf In PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/53211713043.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69150276039.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/65443767915.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/kuradideziximu.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/dumarotir.pdfIn PDF document text
    • http://aquatherm-graz.at/files/dejepifavobunazajeg.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/ferex.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/56355912930.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/64450550157.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/61673220349.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/jutosevosetori.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/63030336887.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/10959888589.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/varejakugevuto.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/zepin.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/518534698.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/8951679542.pdfIn PDF document text
    • https://coluer.ir/documents/file/masuginu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/67687201808.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/847f734abc260a1288edb37f053222fb/jerer.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/49168160624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+save+snap+without+the+other+person+knowingPDF 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_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 10820 bytes
SHA-256: 53f9ea5c4bd9e9031601af06b07e0a8bc643989e7c45ff16b30ece66cc87ce39
font_01_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 18712 bytes
SHA-256: 70b40ac16552a114f9fc23c49db5bddf4aae1aed9325b73e1b0a08f753becc45
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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