Malicious PDF — malware analysis report

Static analysis result for SHA-256 64de16e17e0ad398…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 13:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11642b2d7cb0067da2afe75fc1eec822 SHA-1: caecff46e99f19565d6939dc84edda1c052dc69f SHA-256: 64de16e17e0ad398689e3a038744b7ee73bffb7ff1e986129b60d2504a73c9e6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to potentially harmful content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 4

  • 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.
  • 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://moskvaznaet.ru/upload/files/96437464804.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e255927de2---mimijipokokimuwopefaj.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/wujukokatowosope.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ftdt0ioai9cpl9813ounmvpi4/misamilesudisobob.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/tifeb.pdfIn PDF document text
    • http://bndweb.nl/upload/files/jevot.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/53075687215.pdfIn PDF document text
    • https://vendax.ro/files/file/delekalagifojevewu.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/pevarosilom.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/43388260046.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/kavanopexekudalafuwi.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/rotusoxotuvolowigarubiziw.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/mojasazozituj.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/96097572477.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/16416143956.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/93403136633.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/98872897482.pdfIn PDF document text
    • http://haphadoor.com/upload/files/22906214463.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/91005476610.pdfIn PDF document text
    • http://metall-press.ru/files/pumum.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210923082116.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/92708813063.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/96284737398.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/39055369207.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/vedelafinu.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/kodesaxefotef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fifty+shades+freed+film+downloadPDF 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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 16460 bytes
SHA-256: dd3393dbe9ea73dcae801b34eb0e8ba2d4768f54ef8106a26ac1023417d923b9
font_01_sfnt_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 10796 bytes
SHA-256: 4739b5f8328a5749fdd4e6abc147866be64a2da955ad974c4a1f51e4b896e3fe
font_02_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1