Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceaa35b3e93fdb2e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 11:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f023873761725c8716c4c14591b7e143 SHA-1: 3e981dbb49f537be92b1559353e78ffcc33ef8ec SHA-256: ceaa35b3e93fdb2e300494a9371bd6929c14a9b54485d0fac304132fb89cf106
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm. The ClamAV detection and the heuristic for a link farm on disposable hosting strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3789

Heuristics 5

  • 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
  • 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://chixue.com/uploadfile/file/20210913085409.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9fa0d777---fixejetuletujegojupew.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/73883281137.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/74250220195.pdfIn PDF document text
    • http://compsult.net/userfiles/file/lalej.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///58609329155.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/86680261020.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/78577568450.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/liwoniredavixokewe.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/99715200320.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/29764019534.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/dugemuduzare.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/jarufeb.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/nafapijabozufokikotoraba.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/dipafowaxep.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/45463192313.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/mebomebalufepokifejak.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/mojupobuwofujakudolo.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/39241394996.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/lukezusoninaguke.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/99584137676.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/wibezowoxevu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/55e39d117650e3e591753bcf656367be/vodonowipefugojejar.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210912204916.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/61217634376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=roy+jones+vs+mike+tyson+free+streamPDF link annotation
    • 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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 10776 bytes
SHA-256: 59ae8e4be5180452b832100eb48493e7289a87106b5e7cdddf6d2a6af2736407
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 18692 bytes
SHA-256: aac62ee704576e15e628fdf07f77cec7d214cbaff5a0d2f5ec132f66efedae3b
font_02_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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