Malicious PDF — malware analysis report

Static analysis result for SHA-256 8859a940b21412e9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 22:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89b6bf9d1cfe6e1c71caac9ad4111e36 SHA-1: 7a5e2c5b414446835b9c2e9923dafb2bec79d954 SHA-256: 8859a940b21412e97470e1137ca755b2fc9d065fc4eed83a168362db96238e4e
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier strongly indicated maliciousness, and numerous external URLs were extracted, suggesting a redirection or download mechanism. The presence of JavaScript points to T1059.007, and the likely delivery method via email attachment aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://ntvietnga.com/upload/files/28888408904.pdf In PDF document text
    • https://www.xyoaa.org/sites/default/files/files/gegidopigi.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/22336948011.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/93813558675.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/pagovinadexuxu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/deduxaxixusimunakil.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161376ec66a2e0---welodipub.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/37781372427.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/71041180347.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/51529129512.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/zupewutusizikanawibewunij.pdfIn PDF document text
    • http://upakuika.com/img/file/gujirotawajiko.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/jokuxixagaviz.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/8235233230.pdfIn PDF document text
    • https://kar360.com/resimler/files/42460473289.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/92987534073.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/galupuxarumafiresepoku.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/xomajifiwolitivaronegiz.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/87582365265.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/18706081561.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d564d84a33---gidajufan.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/83981916507.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/sopojumiw.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/50432863784.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/87697687104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=5+letter+words+that+start+with+d+and+end+with+yPDF 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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 17788 bytes
SHA-256: 7cb5b66aa620ae7a2111a075c56cdfedd3cc35910598dfe582dd27d86ea72428
font_02_sfnt_off000122d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 10584 bytes
SHA-256: db2116eb3924750ac2c39b26dd220ed6a778436e8220ee529e6e87c5df4f22de