Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eeba47e1b85363…

MALICIOUS

PDF

76.7 KB Created: 2021-09-26 07:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 193defd855352ac5a43cbe22b7d4885c SHA-1: a5dfe21f89f7b4aeb2131c48e81d028466157bac SHA-256: b9eeba47e1b85363596832c4191a173ff3609986294e3b3e54b72f4c033e3916
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which could host further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nmways.com/uploads/fckupload/file/ranewufajekomisulugomelol.pdf
    • http://gmkms.net/upfile_editor/2021/files/81468994284.pdf
    • http://losangeles.songhakbbq.com/uploads/files/74556483088.pdf
    • https://perfectsextherapy.com/public_html/userfiles/file/vobaxe.pdf
    • https://unique-u.biz/images/uploads/file/82282799434.pdf
    • http://abwingstop.com/uploads/files/kunujakuw.pdf
    • http://abwva.com/uploads/files/94037965050.pdf
    • http://lev-steklo.ru/userfiles/file/17096261771.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/rekoj.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494aae80313---80835861062.pdf
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/76728475753.pdf
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/4814649525.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/19506384910.pdf
    • http://gartenbaukoeln.de/uploads/files/mijajemevepazowejukeliwij.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139f923ce115---rigudetalumefi.pdf
    • http://pooq-design.com/app/webroot/fckfiles/file/62611140091.pdf
    • http://chipgene.com/image/files/20210906_064829.pdf
    • https://omegaplus.bg/uploads/pages/files/88196799430.pdf
    • http://dreesmann-foto.de/userfiles/file/43915619126.pdf
    • http://serdceprirody.ru/userfiles/file/zidunukudelafodo.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/zolosupepepo.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/kujofoferix.pdf
    • http://fabiocaronearchitetto.com/userfiles/files/rinoga.pdf
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/5600171939.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=online+movies+2019+bollywood
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf52.bin
47917d0fcc3063a9489db89518ddca4ecbd035cd6cc202f186b42745873acc5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF52 10940 bytes
font_01_sfnt_off0000d8c0.bin
a5fa0defdb4b33b953e77283aaf1704f30729451acb6439b9a4f68b65896e98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 20120 bytes
font_02_sfnt_off00010d31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 16792 bytes

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