Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bd8ee08eed7aa1…

MALICIOUS

PDF

81.0 KB Created: 2021-10-10 19:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 905590b33210dc73e3a26c6a25619cd9 SHA-1: 6b298de27a587e3d08f45f9544db0a17deaaf8c1 SHA-256: 09bd8ee08eed7aa1ed817cf0154e899f4f79110173fe773cd289a5bc1f933591
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gatewayhotelbangkok.com/upfile_hotel/files/nomogusedidi.pdf In PDF document text
    • http://wflyyxzrgs.com/uploadfile/file/5669ec3c788178c56ec0ee7309d258a6.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210904231727.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/tutibumonuzizenadez.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/42988515010.pdfIn PDF document text
    • http://someteme.com/archivos/_20210902011706.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/41535251235.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/zavesigedowazuzaxunuv.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/2428490350.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/66414557187.pdfIn PDF document text
    • http://abnicum.ru/files/file/mezanekamajivosaxit.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/ripefafipitow.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/furerigenazagugumizel.pdfIn PDF document text
    • http://infunplastic.com/d/files/2485773498.pdfIn PDF document text
    • https://ampayroll.buzyhub.com/files/86645470920.pdfIn PDF document text
    • https://granitnet.hu/editor_up/48593807168.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1615a79afcc284---wokoguzotazevaruzu.pdfIn PDF document text
    • https://gornjastubica.hr/files/59534134987.pdfIn PDF document text
    • http://boq.internet-match.com/upload/files/57810655622.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/11764264550.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/sapomafamazetiniz.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/67665348593.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/13599945871.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/50857381804.pdfIn PDF document text
    • https://coluer.ir/documents/file/sidurax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rock+n+roll+sushi+pricesPDF 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_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 10448 bytes
SHA-256: ff859d68a74bf1066ba2da26aa1f0c995a7339c20949f4f1e8c1bd181328be42
font_01_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 18816 bytes
SHA-256: 57b1b17f6f2e30dc01644028a53f4ee2d90f76b7c6f0777af9a50aa97586f6f9
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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