Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a29590e5b4246d4…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 00:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d0260eeee203d753358dc52b0be65a6 SHA-1: 82161ee2c9b484831f4a660534c036a6efd3289b SHA-256: 9a29590e5b4246d44e4e5d47bbce42b30f1db675f6a5f50def04fa6b40ff48f6
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 PDF files hosted on different domains, suggesting a link farm designed to distribute malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bachtungcompany.com/upload/files/87644929855.pdf In PDF document text
    • http://lotusburbank.com/uploads/files/fivigiwibuju.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161512b84687d2---67689611935.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rvr3clqovc12vikqjssflmpklg/sobusuvezegozosebezuvus.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/46988259187.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/naxatomobukudazajoxis.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/fexulofedimafoj.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/moruranutaru.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/xazevujatatokewotevopazev.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/renosonovu.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/98348586818.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/54233230234.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/tujipasejufepefazuvaxibax.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/44415679230.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/25312482117.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/30770721277.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41024053651.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/limodiwowopuwavaxe.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/9051497278.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/17777254482.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/32853197720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fear+the+walking+dead+season+1+123moviesPDF 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_off0000ad82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 11260 bytes
SHA-256: 194ff3a4cf7149f90e333c13121602fcdc64fe572d48bf52cd3a34df7cd62e75
font_02_sfnt_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 17232 bytes
SHA-256: 0bc969b587e95acb2cad966a9afe40124b0a70df527dbcde3a80e124c6ada05f

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