Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee3a88640668cc0…

MALICIOUS

PDF

91.7 KB Created: 2021-09-18 02:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec729692fa9eb34c25c955ed28df793b SHA-1: 9d9ff9c4afd32da15fca6dcb8a0763b4f2226127 SHA-256: 2ee3a88640668cc0578aadc7aa6fa12ab976dca612370d8c58d78672314cd1ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=largest+country+in+the+world+by+land+area PDF link annotation
    • http://cheumst.com/upload/fckeditor/file/70282697992.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8537ce563dff504a78af739258b32878/42234007539.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/9453289933.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/3483368678.pdfIn PDF document text
    • https://kimcert.net/E/file/lisijaj.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906102450357.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/95481920240.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/milimuputizebabatuxidupit.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/19534883593.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fobidetuwux.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/61670033671.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161403f550762b---68175550268.pdfIn PDF document text
    • http://northcity.rs/slike/files/sowabagekabob.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/25365209885.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/nedox.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210915_220159.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/foxubopidoliwatojawid.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210918051138956121z54db.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/tomaruvaxusepumifu.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/71241124513.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/66815525745.pdfIn PDF document text
    • https://shibbirs.com/media/files/javuzufazatekopewu.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_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 11048 bytes
SHA-256: 8759fbe74727c8d648f5484e2873d13b4fcaccbbcc131ac0bacdb4b94eea4f10
font_02_sfnt_off0001312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 18672 bytes
SHA-256: 0a1e60fd7d43dc3f942dd426cbbb607dc849f53c5c3ff3f9445cee5ef3dccc8d

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