Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbc00749c1476b6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 04:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 860ba68f2a1df9ade90dffc2ed7ce5f7 SHA-1: 33ad086c106707d03d423d8613876d9e4bb0970f SHA-256: adbc00749c1476b66838ea1de059b1a8770917492c078cd4672be32bf846b9cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51901911588.pdf In PDF document text
    • https://webrobogo.hu/kepek/zagodezisosur.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/80587075215.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/58241004034.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/tesiwudawezezuzavidutij.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/pejebuf.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/sozesiwafoxaxowukezokas.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/natiloluz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/38c1bb5e2b4b0b99232ca822a04e1579/kazijikedelexek.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/vesafalad.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/bidigewuru.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/31683927503.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7bc878e1c0a2b18bb1bbd181ea405ffa/16853031729.pdfIn PDF document text
    • http://primaneighbors.com/userimages/6278167774.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/vubenaro.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/12784401125.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/jamerikuvijisezoxezivoxer.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hui3o1dri279hd44v8os2nv3ph/zusoxatepuribavekugudex.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/22060953316.pdfIn PDF document text
    • http://standardamulet.com/files/files/595300789.pdfIn PDF document text
    • https://swiz.eu/files/editor/54993441525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wifi+utility+app+androidPDF 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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 17296 bytes
SHA-256: ceeeab96dd7ee66640d35e965befc5331b7dcc8fd06d9b20aa8cd42639117e31
font_02_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 10396 bytes
SHA-256: 91e4208366ce7f500ccaa7e46762d67556bbc85cbc2e85b55cd5a5f13cd6ecb9

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