Malicious PDF — malware analysis report

Static analysis result for SHA-256 536941c130052df9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 14:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e886f9968e93863e6c3bc3f63c2e06b SHA-1: 0c19ce9e8a542362b55b1593307e7754e2447d79 SHA-256: 536941c130052df9bd6a5e39c1de1fc8e4af8a3ad11e33c850ccc04c6492f19b
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 part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ghibms.com/userfiles/files/vexezimutebumemosijikiraf.pdf In PDF document text
    • https://seo-methodes.com/userfiles/file/zojefasadavejipuke.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/25433506453.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/wukiwuturevenekejuri.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/9797190987.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/64391989850.pdfIn PDF document text
    • http://wenxuezj.com/images/File/77680630433.pdfIn PDF document text
    • http://nemochem.cn/upload/files/nixuka.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/75737843502.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/39787677477.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161458cf72ea2d---15448837904.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/muzis.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/jazobiwodotapudikofujoji.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210917162422.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/tazusubozupitus.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/27085193745.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/57828822870.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/54209221977.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/suregulitilumanava.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/zopof.pdfIn PDF document text
    • http://sbkf.org/files/files/sanurum.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/4042934507.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/42954415565.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/wunededituwito.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/3425511693.pdfIn PDF document text
    • http://fullx.net/files/gotalojav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+wireless+application+development+volume+i+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_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 17152 bytes
SHA-256: 2cc6900a4c223998000f34d1a382d7ef1e541edfb75f4c551d9d2b3cc78863da
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 11016 bytes
SHA-256: 3ccaa6faca337153761c7e745df502b6a2c27b561f3910425d26cf4d55cc7841
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1