Malicious PDF — malware analysis report

Static analysis result for SHA-256 32542c2ddce8823f…

MALICIOUS

PDF

75.8 KB Created: 2021-10-02 09:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6621500ca5c12afccf5b7ef13c4a6402 SHA-1: 19320f971a53fc407bc73c24a2a544951c80fa6c SHA-256: 32542c2ddce8823fb1cb1496215eda3bdc07ef540582450208e1730cd8fba328
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oticonshop.com/ckfinder/userfiles/files/84292042626.pdf
    • https://teater77.nl/userfiles/file/jutozadimavanumewivorakeg.pdf
    • http://ttmplus.com/userfiles/files/33370611618.pdf
    • http://zwickerfoto.hu/_user/file/95613411323.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/dafowogekegupotokuv.pdf
    • http://vollaracis.com/UserFiles/file/50626933084.pdf
    • http://istihdamhaberleri.com/upload/ckfinder/files/95001790537.pdf
    • http://hwayoung.kr/upfile/files/26233996334.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b10b628ed4---fuvibolumugedumoropomumig.pdf
    • http://compsult.net/userfiles/file/bodowufidepesoxuvuta.pdf
    • https://producto.works/userfiles/file/552063777.pdf
    • http://peknanevesta.sk/media/file/3450173415.pdf
    • https://sbsoftware.ro/admin/userfiles/file/78631264305.pdf
    • http://hmsendo.pl/uploads/editor/file/49281255032.pdf
    • http://sinproval.it/userfiles/files/40761396685.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/zukiwafufijukapavetesari.pdf
    • http://a-mega.ua/images/uploads/file/sazaralusenafex.pdf
    • http://autosoftware.company/autoresponders_images/files/54824242038.pdf
    • http://csim.jp/ckeditor/uploads/files/lunaxezarusapik.pdf
    • http://saovietgroup.com/upload/FCK/file/74383493803.pdf
    • http://rgn2u.com/userfiles/files/molaz.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/kawijewakuj.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/gegorupenodopojo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+meaning+of+immanuel
    • 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_off0000be19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE19 16792 bytes
font_01_sfnt_off0000d630.bin
8407842f3d120f0c39db16cd048b952491176a17fda921955adbeacc962c5046		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 10360 bytes
font_02_sfnt_off0000ed55.bin
051d2e70f4fb1aec7981a4933f3874830f06794633da3e15b1c40f46311cff19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 20216 bytes

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