Malicious PDF — malware analysis report

Static analysis result for SHA-256 8540fa329929f74d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-10 03:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fec71d18a55e1e91a2124892f45614f SHA-1: 8308b565ccc656a84befb99ff332e7a61c457ec5 SHA-256: 8540fa329929f74d13932e8b7317c6ed9223da5392e83a3e7c8554be2c20bbba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://eltdb.com/UserFiles/files/xalaf.pdf In PDF document text
    • http://klpa.net/userData/board/file/47238063242.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/67398580658.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/58319873489.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/woletegoxogotakunuwefofof.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133336d0484a---bipimitolotenivipapaxis.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/tafibirime.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57033683266.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/sofosuzenar.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/1183593271.pdfIn PDF document text
    • https://blugarden.eu/file/sofomububeluweriliwuju.pdfIn PDF document text
    • https://binhvi.com/upload/files/fizoriwimuzupamu.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/42985696190.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/68959851817.pdfIn PDF document text
    • http://elitvorota.ru/f/file/84669772051.pdfIn PDF document text
    • https://rajakedua.com/contents/files/jojinegisujasemuse.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vanixakiwumanokeru.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/gofaz.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/vulisutipuxovitafe.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/guwepesemap.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/rajuranedafununawivekexo.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/50721642628.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d6dd881e---bilamumiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=8+movierulz+2020PDF 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_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 10316 bytes
SHA-256: d8082260fa0aebf697fd023193de250ea532793cbe25fe2a236f273303b3e9ee
font_01_sfnt_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 15416 bytes
SHA-256: 7eb65d2cfdca4c03aaf79dcceda4b5a2b980013e26c704cfe3e7464a5c4845c0
font_02_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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