Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfb1fba1736646b…

MALICIOUS

PDF

74.2 KB Created: 2021-04-07 05:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 370d6b8e9085619feb10f3dda3ca8e1d SHA-1: de076dc44928351a5e127972d1e48bb04b820f1b SHA-256: ddfb1fba1736646b143f3eca7154f174cbc8b3150090db1adfc94dbd04bf2a3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as webform submissions, suggesting a phishing or credential harvesting attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host a large number of links on potentially disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 https://www.clinicasfantamaria.ro/sites/default/files/webform/33767122539.pdf
    • https://www.woonsocketri.org/system/temporary/webform/kebadewanizokodijixupid.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/mibotemesasis.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/wogudodijanaferewinige.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/21030689395.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/32675510575.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/wajuso.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/27017481005.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/keborezuvefubivuw.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/todoxobolukajit.pdf
    • https://aboss.by/sites/default/files/webform/10891008032.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/pefusoxewirevujilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=new+opportunities+beginner+teacher%2527+s+book.+pdf
    • https://umatter.princeton.edu/system/files/webform/requests/tutoturabawukaxubudevodor.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/lezedatabamivija.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65a.bin
3e22af46cb7dbdcfe66dab4c53838d70bb8501086fffd5fb3af22f488b2d6ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 5716 bytes
font_01_sfnt_off0000e9e6.bin
636a3cea3aa29d6d423cba153317d91724c5865562025d03fe0d5a13e7fc47f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 16184 bytes

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