Malicious PDF — malware analysis report

Static analysis result for SHA-256 743a2ca76ef59a84…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 19:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a68f359d7e4bfb02763fb1495fdc93f SHA-1: 1de4c074492d155f0d1e8042460ef35e5f2bf2b0 SHA-256: 743a2ca76ef59a845bcaece59b63eeb657ae04a00da1232e3cb474916eaf1c54
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains a large number of external URIs, many of which point to disposable hosting, suggesting a link farm or phishing campaign. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://archism.ru/uplcv?utm_term=resso+music+premium+redeem+code+free PDF link annotation
    • https://firesystem.ro/imagini_ws/logolexosavixebe.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/venovesigegijizax.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/64522285432.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/garorovokolejup.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/93371259307.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/99404737494.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/vifivagofonefuw.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/76495181486.pdfIn PDF document text
    • https://soechi.com/userfiles/file/33873565498.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/goporanaxeriletatuv.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/direm.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nenuni.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343eec10053---vikejojivavitusukowatof.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/43750567384.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/1120725915.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/27830808140.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/93916754483.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/39523766552.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/90887513393.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210910file///53961292938.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/roraxubikel.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/laxedexofukagomuvabewo.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_off0000d219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 10516 bytes
SHA-256: 69590e27f95fd06be90e8aaec219896ebbd725791f95a623b181be21afa22a26
font_02_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 19092 bytes
SHA-256: 54e11382dd64efe7124297a42f93bd4b702c77a759668fda01aa06a64b2f7546

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