Malicious PDF — malware analysis report

Static analysis result for SHA-256 94dc2dd41278ddbd…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 10:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c9e8667b100c758eccadf86d54b4a2d SHA-1: bda7baae75ce002844f46001755436603f2a8c5f SHA-256: 94dc2dd41278ddbd31fff1fdc996f2b0b4cc2769a5cb795d9796f35ef4646b9e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://naturenhuman.com/app/webroot/userfiles/file/68524818400.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q8liulcravd44v0v7k5dgu63b9/tinozizajivipoxuwawu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/pezuwufezujuginurexera.pdfIn PDF document text
    • http://screen.by/images/file/kavowubat.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/navewotapegiwusegur.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/1662027331.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/49063491369.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/sejubikudofet.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/efa5dd612d7823da3522f61309d2970d/46940294150.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/790508996.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/kifisefi.pdfIn PDF document text
    • http://elitacasa.it/images/file/66175370570.pdfIn PDF document text
    • https://breedlife.com/upload/files/41894688541.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/xuxowobuzemivuve.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/zofesikanimupoloju.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jozovuxopoxilekozaduzaxo.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/42337169038.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/zazaxe.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/88742553935.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/98520906952.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/vefusafagakibo.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/54084702676.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/furilowevupepizifadaguzej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=technical+analysis+of+the+financial+markets+by+john+murphy+pdf+free+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_off0000c39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39E 16884 bytes
SHA-256: 169d086cc67f8fcbd5def9b2beff7ebe626f7209cedf4b95ec9d6216b64875f7
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 11512 bytes
SHA-256: bd16f89358352638783435f90b3711e636cda85b94c6e2c72ed069c5e7d958ee
font_02_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1