Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78db58088745f47…

MALICIOUS

PDF

89.6 KB Created: 2021-09-09 09:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70a6f16eea9efb5e95d5af03436b2d9d SHA-1: e3f67a177a033cec272f725a44e937a6abd60e4d SHA-256: d78db58088745f476943fdf0cb4256e4f04c8e1ab408a98ac59fa9e075f177c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://stlukesfp.org/ckfinder/userfiles/files/rimofo.pdf In PDF document text
    • http://attlas.center/userfiles/file/vetikuxelowuba.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/81810891281.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32158257697.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/47999790164.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109091120554651.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wakifafugi.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/repemo.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/51208399029.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/naguxemeluwamuwi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0251e44fb---ditatuzanadifakag.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/tejunobaxoled.pdfIn PDF document text
    • http://kag.fr/userfiles/file/gurarakagakajexa.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/bekonirinetunadidimena.pdfIn PDF document text
    • http://csp.hu/editor_up/vorozu.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/negemadomobalibogexitanod.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/23497187750.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/miremidiva.pdfIn PDF document text
    • http://vaynhe.com/upload/files/63767179991.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zutamiragezomitup.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/repax.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/jerukixoxumu.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/29408681973.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/13879646711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dls+21+hack+modPDF 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_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 10376 bytes
SHA-256: f5b8665ba4c7d7a0b68c2d4e1e0261ca17a34ef1c4f8e80f038be978e24b745a
font_02_sfnt_off00012b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0E 17924 bytes
SHA-256: 2e47304784a5a57130aee7dd9c039681ced56e8d8159069a2a7458f20d5213c5