Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0062fd8e05538f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 17:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e013cde9cec6299019ff85c7044c8d49 SHA-1: 09934f90b5814cdd5195c08bad7a3cd1a35de5d3 SHA-256: 8e0062fd8e05538f64d371095e18ab0a13d561910b3465b7c40f3b51f0b3e5fe
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to obscure the final malicious destination. The ClamAV detection and heuristic firings indicate this PDF is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3637

Heuristics 5

  • 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
  • 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 https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161336d0e47b84---24611233345.pdf In PDF document text
    • http://korytnica.net/data/files/33678148347.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/wisuzalolurufuxokavejufol.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/wafipifowurodegomexege.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197848285204.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/jeros.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/lutaxenaduworilewe.pdfIn PDF document text
    • https://felicityokolo.com/file/52140951500.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/jakel.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210911155000.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/jedikipifukezejolemututo.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/67676296088.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/27799523794.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/83554485459.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/zeloguvobutonevabavog.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/kofabowimasemelelorupo.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/61239700000.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/30379896165.pdfIn PDF document text
    • http://sun-tes.ru/files/file/sugufugosatojajikat.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/68012647771.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/82920564750.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/xanawirazufikitovez.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/23871206967.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/gotivap.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/tunej.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/73466919526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+flash+game+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 23372 bytes
SHA-256: e2845eaa996e1f2eddbacca914fb8861114faa0312b1abba6e3cdfc9ffdacfd6

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