Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1953433728a922…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 18:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5c4f8fca6fc5ef048b37f1f8f23a587 SHA-1: 22371bbcc209fc0917530aa93405a724f9526d82 SHA-256: 7a1953433728a922136402278a8f4ce15965977ed955734fe3b1438f86d2a626
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically flagging it as a 'PDF_SEO_DISPOSABLE_LINK_FARM' due to a high number of distinct hosts and links. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature suggest an attempt to lure users to external sites, likely for phishing or malware delivery. The PDF's structure and content, including the authoring application 'wkhtmltopdf', do not provide specific family attribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://tcihk.com/userfiles/gexironew.pdf In PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/77681465038.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/95356230184.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/nafot.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/47729487209.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/8293523954.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/xevanosijoda.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/kufewadarus.pdfIn PDF document text
    • http://deforma.it/userfiles/files/98005225894.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/kugeforoxil.pdfIn PDF document text
    • https://ip-pharma.net/data/files/pazofilixotamivunikol.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/61002991663.pdfIn PDF document text
    • https://kawanmto.info/contents/files/wudasobunaxegiduposel.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/fbf3d3bb28cfe86c808ffe398924f679/jelupazafemofajuro.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/79764433757.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/86814271281.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/84551622363.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/joresiba.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/77810680357.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147cef9c79c9---29175681308.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210908_60193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kabhi+khushi+kabhie+gham+full+movie+hd+download+for+mobilePDF 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_off0000b223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 11176 bytes
SHA-256: 369a546585406135e1dec768e85f9e9527a13bfbfe8fbe17ab1f13e60285b92f
font_02_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 17692 bytes
SHA-256: a859240e0a01ee546587b12297b9c28827da2bd421511b518bdce629fc15bcd8

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