Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbf724ef9241d50…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 03:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 492f1a84299855e381a9120d85f628e6 SHA-1: 5aed79afd4d44e1091818299be6e7e0a7fe02818 SHA-256: 3dbf724ef9241d506d278a95f0ab30d974958ddb684cede892b2c0f0bbfefe8d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 to trick users into downloading further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://streetnn.ru/data/upload/ck/files/kagenetovadusivodagafati.pdf In PDF document text
    • http://langfordfinancialservices.com/userfiles/files/3752981817.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/xevazetazov.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/mivepinubupegawutaj.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109060944282987.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/96016396518.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/witanul.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/6641309473.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/vikojigigepedabuwufi.pdfIn PDF document text
    • https://digiconelectronics.com/media/letuvu.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/72442761248.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/wepajela.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/rifunaguneta.pdfIn PDF document text
    • https://digireg.lu/upload/lupolotuvijapile.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kilafetak.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/samunel.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/vorisomasukadasememezivez.pdfIn PDF document text
    • http://tfforming.ru/d/files/46881851873.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/77600129796.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d03f9538b5---72409896921.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/93337629927.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/gegazajuk.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/70855819299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hi+q+mp3+recorder+full+apk+downloadPDF 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_off0000bc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC78 16932 bytes
SHA-256: 4cb6918bc7050ee7f20934c52f3d88b7951670c3548be0cad6954e720bf6f775
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 11104 bytes
SHA-256: 4a555faa67f53e16675530d365998dee9f4cd0e6d356dbf2b5bab06a7160bcc6
font_02_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1