Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa99f5fae967d3a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 11:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 717f57e4d77b48be39c2b6c42c5a9044 SHA-1: 43df3000e491032963d860b2df8fc1a7a8d6270a SHA-256: eaa99f5fae967d3a4266d1c269445007ae550ab1eab5fa01a6bf34b99f4a4aff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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

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