Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a311d525b834ab…

MALICIOUS

PDF

85.0 KB Created: 2021-10-07 10:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b963f182e7e734f19f2df32bbf40657c SHA-1: 1f07a5595cb2cb0f30ac6f35a3d8ae1f3932c0f3 SHA-256: 73a311d525b834ab95bdf4362ca970b874192c7a8fe00dd841065ae458a7026b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tt-ural.su/admin/ckfinder/userfiles/files/tifodonemaruzo.pdf In PDF document text
    • http://gmart-express.com/demo/uploadpic/file/16304035254.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/rutepovez.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/9454989222.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/72795522139.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/fevigapixabepixe.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/pifinib.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/47963952719.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/sebagitelifawiroma.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/2401755953.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/3753479790.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c7be81345e---45638504981.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151b2b48e5e9---tibimitomozizamujopidobi.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/84496772453.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/32946458234.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/pilolubemulusumiki.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/futireridowiseb.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/mifutu.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/41608137691.pdfIn PDF document text
    • https://apagar.cinemadossertoes.com/ckfinder/files/vebotawupebi.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/32442354255.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/7157353225.pdfIn PDF document text
    • http://protezas.lt/i/File/61483658163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=acceptance+of+appointment+as+successor+trustee+formPDF link annotation
    • 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_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 10676 bytes
SHA-256: db5f40540782a76f8be99e61f5de9bfa3226d22e56c85e1aba9e879d20ba53a3
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 18608 bytes
SHA-256: 17c66d35873f16f221ba52c3747ba19ce28e4352d82cbfb123b27376db1263e1
font_02_sfnt_off00012d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1