Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2733214dff1375…

MALICIOUS

PDF

97.0 KB Created: 2021-10-07 21:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f297e445428ed9b7e2075224f5f2e1ad SHA-1: cda2e1bbc07e2582ff3daf6740ae2a8f0a661f0e SHA-256: 3f2733214dff1375e37020d06311acc9e7e675d3370c3862a3a9f26456948b3e
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. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://giasudaihocsupham.com/Images_upload/files/kepip.pdf In PDF document text
    • https://big-affaires.com/img/pics/files/taleworasaferu.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/tokonixamul.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/fuleguvodan.pdfIn PDF document text
    • http://mastervin.ru/files/file/21449126502.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/avffrdnd25fgm0bttlulse4i3s/71789735461.pdfIn PDF document text
    • http://ucokampen.com/media/files/44779029654.pdfIn PDF document text
    • https://greassi.com/editor_upload/file/xonop.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/60674930760.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/nekozaledusatokujokoxaval.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/28159008916.pdfIn PDF document text
    • http://ty-int.com/files/files/puvadub.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/43391105959.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/wovebe.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/11756036287.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/26778800245.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/69133860593.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/bavunutuju.pdfIn PDF document text
    • http://healthywithhart.com/res/file/loziwedibema.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/61173487963.pdfIn PDF document text
    • http://dhf-china.com/d/files/16454041907.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93202436272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+many+shots+of+skyy+vodka+to+get+drunkPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/78766868294.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_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 11112 bytes
SHA-256: 24d523c045f43bef457e517153d41c487f6af4ae2b40f4d393dcb0a1436ccb41
font_02_sfnt_off00013dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC9 21720 bytes
SHA-256: 7fab72b6d824ed9e10f4d8936f94f8fb21508300570a9ee19fb494fdcce0850c