Malicious PDF — malware analysis report

Static analysis result for SHA-256 e718e0a301360afd…

MALICIOUS

PDF

75.9 KB Created: 2021-09-25 18:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac747d6bed9791c62e4b5d6ef4b228d0 SHA-1: 1daab5c45c1e7e6917729b869f3c456cc08ad931 SHA-256: e718e0a301360afd16b58e46cc523cd85121b530e3f0e823c5505ce5b44b4e9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan strongly suggest an intent to redirect users to malicious sites.

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://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/15295897975.pdf In PDF document text
    • http://weddingdove.tw/uploads/files/202109181527072813.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b391a058---39462124360.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_12E0B6AF068EF387.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/15291365822.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/jabutifebuponakewemirim.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/bidakifeposofimag.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/45660445718.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/wonejake.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/99728704745.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161319c8588508---fizof.pdfIn PDF document text
    • http://napiarsaigh.com/images/20520505754.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/xadesusadubekeretodedine.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/91172655823.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/96943206453.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/40977388174.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/netebesowuviludebote.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/81362323168.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/nutikekuleloxisilanomo.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/muwozev.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109140527561524.pdfIn PDF document text
    • https://viceda.com/userfiles/file/25507021003.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/6573509764.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27813019663.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/xolaxituwasuterevaxatupew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=descargar+mortal+kombat+para+androidPDF 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_off0000c151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC151 18316 bytes
SHA-256: c10ee90a7d38765f63830205403ba056f2a12da20ad290ddc29285d4e98eb8da
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 11088 bytes
SHA-256: 0083686a5b3a4f984240e23ff4a4428727b89da7b58acb879244c41518fc4fc6