Malicious PDF — malware analysis report

Static analysis result for SHA-256 faeb38957f2d070a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 21:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9ffb767a75b766d1fc56f0df5cfc7ff SHA-1: 2319744463793f57c8c75b4ce18f03d9c3691f97 SHA-256: faeb38957f2d070a05b8b5e45b3532921084c7c742d528e7583a5633a8861f9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://kalmi.ru/upfiles/files/rojevasagalatakixowi.pdf In PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/31172226101.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/1663362573.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/zugiluwomosapobun.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/72397592720.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/77574626425.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/86957727657.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/76440149204.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/fajawotilo.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/ribebobadepukozuveso.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/lepavasopagivetodutaner.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/dimuxomibomikezulep.pdfIn PDF document text
    • http://abpaluso.com/upload/file/76450054516.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/77680435299.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/filowutelixido.pdfIn PDF document text
    • http://8njl.com/userfiles/files/wukoj.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/12914890334.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/kanof.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/mumebiwi.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/dakuganuzawowixumomonitan.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/97702002387.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/godalotutunipivejup.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/30128694599.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/pitux.pdfIn PDF document text
    • http://sun-tes.ru/files/file/tisobi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613408dcc5808---zinebatuzuda.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/kabegenupan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fruit+diet+plan+pdfPDF 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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 17188 bytes
SHA-256: 1396451c3d23aa8b08dde4ec75cca8139db447d670096ffa59426e73a342d49b
font_02_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 10280 bytes
SHA-256: dd7f3a6aa5ac3ce3088988d3913a6e4a1d26b9ed6b205f731a3f99d2b4dd79f3