Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea855490e5a498f3…

MALICIOUS

PDF

65.0 KB Created: 2021-09-09 08:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b42927882fc9badf0ee104ad1a5ab68 SHA-1: 5398be276e5f32b39cf17fe7915a46ceaf2db048 SHA-256: ea855490e5a498f3373e2deb6a8828864be226f74ad31f91088c67c3c43bf922
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript is likely used to exploit PDF vulnerabilities or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5755

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://cuacuonbinhduong.com/upload/files/fewitot.pdf In PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/xuturavoverapawokuseto.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/pozifovezere.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613960af32332---81866139527.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/tolinigafiz.pdfIn PDF document text
    • http://fullx.net/files/92595644281.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/pugokurapavatatonewu.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/24973907407.pdfIn PDF document text
    • http://etre-belle.su/images/file/35907286754.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/ridukilobazilejen.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/35707444744.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/49471409169.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d13fe6c4e---xubid.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/lebirefapobokukesosiwu.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210909_50146A333B29D024.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/36909608312.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/51840001699.pdfIn PDF document text
    • http://synphabase.ch/upload/file/fegamojiposi.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/23290240294.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/82535173326.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210902061319.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/58517011944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=peer+to+peer+connection+in+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_off0000c64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64A 10292 bytes
SHA-256: 497707260c1db3efb5187668125b7e9b24415b55f5215e644a9e5e60cbd096c2
font_01_sfnt_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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