Malicious PDF — malware analysis report

Static analysis result for SHA-256 966fdaf169c3ba54…

MALICIOUS

PDF

110.4 KB Created: 2021-10-07 11:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 075ddf3f934b7539a49f79b2bed82981 SHA-1: dca90e195d8287de26b0b71592001f74f505770b SHA-256: 966fdaf169c3ba5427f1b49bb63d835de9ecc95b2ebf4a288cf6c93c79206836
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 pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to T1059.007, and the nature of the document suggests it was delivered as an attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://associatedreclaimed.reclaimedoils.com/userfiles/files/46675178926.pdf In PDF document text
    • http://bancasemecanino.com/userfiles/files/87403981865.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/22632758153.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/25240228448.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/16613911445.pdfIn PDF document text
    • http://kleiberit.ru/files/file/76684812383.pdfIn PDF document text
    • http://esistore.de/userfiles/file/kawolatiguxuvunuzadup.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/pezutomogo.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/vurajaxerikalenatinupogiv.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/206f7874028a428a7fb7cf7594610f0d/74172159193.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/filege.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/jewemeteboxatawalejiwune.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/vevomireruk.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/46974479703.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/soxako.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/6178928572.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/gikefobofa.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/bilonurerididube.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/79191160085.pdfIn PDF document text
    • http://wdnederland.nl/file/95293307245.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021100300442362.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/penujizakukisolig.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/53899116858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=national+policy+on+education+2013+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/ximugedenubesafokawafe.pdfIn PDF document text
    • 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_off000145de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF0 20036 bytes
SHA-256: 9960e9993a8a6358f0cc7ebf791e5716a80338060396309a17c45efe704da3a7
font_02_sfnt_off000191a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191A3 11004 bytes
SHA-256: 3a5d91611be834e8ba7e27d1713b074e2e488df38163559b68a98b5b98d2bd39