Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b4c379f214d36e…

MALICIOUS

PDF

102.2 KB Created: 2021-10-06 19:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dfece678ffcbeaf6b441396ced61d381 SHA-1: 5003c026f313edf28ddd47e03584ff648048d3bd SHA-256: 24b4c379f214d36e04111e32f1300cad7ff665b60bdee34d74c436a2239bc099
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://e-sheremet.com/img/veremafimidibes.pdf In PDF document text
    • http://seed-hongkong.com/uploads/file/vajirexivigemegovufinado.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/lexadefajozurevox.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/sozakejokujasik.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/rowagafedo.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/34455380736.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/sajipujodi.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-25/images/files/dirosubuvefijamof.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/kuxalu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d4e34b31---51687197058.pdfIn PDF document text
    • http://pk.mo/userfiles/file/lifiwupani.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/nodebesel.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/talitufefakolumosigu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613132c33e4dd---bubenilo.pdfIn PDF document text
    • http://aqgwegfjdlk.handyfriendship.com/upload/files/70609076106.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/rewaga.pdfIn PDF document text
    • https://motecx.com/images/file/gabutaratiwuvupimujumeku.pdfIn PDF document text
    • http://apple888.vn/luutru/files/xisatuve.pdfIn PDF document text
    • https://cicimanis.com/contents/files/19199716997.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/torerorufowarazitezazur.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/93995438632.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/10925772293.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/budejusexiposifove.pdfIn PDF document text
    • http://llux.vn/uploads/files/jusepifufi.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/pefamokatevapalibarekoj.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/zavonumib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=famous+mozart+piano+songsPDF 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_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 20712 bytes
SHA-256: 41fc5095068318e25f89a354de1a21f2b3d4c93cc985f0d308e7ddc83952b216
font_01_sfnt_off00015a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000172a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A1 10552 bytes
SHA-256: 293a5d95a763e1758a4739a371afd3b0b905a692a188b8fd0debaa821f5ddbf5