Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fea0d2d746c9ceb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 11:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7b58e0e589093c940b666ff243703aff SHA-1: e05f53c6fb639c1dd07292751b21b0818fdf498c SHA-256: 3fea0d2d746c9ceb5eb943286c7a8133f91d64f248eaf0bc6cae9b2a0e9a7725
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://abwingssuffolk2.com/uploads/files/kugumebepizelila.pdf In PDF document text
    • http://elai.kz/upload/2021/09files/210912064553309314xl1gv.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/93829557660.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/12488091434.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/31586624446.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/22561012908.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/53640903212.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/fedofujomafutedekex.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/19430950582.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/36283040682.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lutuxagefixujopemuzizowuf.pdfIn PDF document text
    • http://potlista.com/file/files/ruroxuxabuvewasowifu.pdfIn PDF document text
    • http://cascad-trans.ru/files/lekuxuwudekanulutudo.pdfIn PDF document text
    • http://momsystem.ru/public/file/gipabekuzosadabuzesi.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/rewejinit.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/76896197192.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/22766690056.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/daxefuzotowojizulovizop.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/zokesogufazad.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/52059434491.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/semibovagijudogebafeve.pdfIn PDF document text
    • https://aokman-drive.com/d/files/xumeraminakisagejo.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///funupelexamedidofobonozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=location+tracking+using+sms+based+on+android+mobilePDF 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_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 11000 bytes
SHA-256: 5f3f3a3b633530164de258ee3caf4e9378288ebf17572708b01ae444f8953e41
font_01_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 17180 bytes
SHA-256: eef058b04d5d7bd65ceaa1d719c37fdf340106b9ccfc4a7610448ae401bd8493

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