Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e206b7eaf99bba1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 10:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce1c3005f45e95a585aa42e3878b0ecd SHA-1: 61c7f8c6b90ff592e2251ec5d52481311df5f2b1 SHA-256: 2e206b7eaf99bba1e52da8b1136e76dd8ff109bc30d224ebcf85f91c5af23a94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF is designed to distribute links across disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest it may attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://zatoodesign.com/userfiles/files/nabaxirowosunus.pdf In PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-3/20210903120538930186.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/3627677797.pdfIn PDF document text
    • https://sanagustin.cl/files/jetajulozupevajodoxifuru.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/59881803025.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/47348367340.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/68977306585.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210916/file/juvot.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/rolajite.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/52314338955.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/35847546881.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/lajojesofezasobozulofi.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/47935341506.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/dobisoduzi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tobel.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1986362be---pusib.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/13444879519.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630954225.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/nowovupekanifimuz.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/13128512096131a52e82c7a.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/58436306533.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/n2p89g5gnk1lp2j9ebsqnqfljb/12021994314.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091116013111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=roms+for+emuboxPDF 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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 10260 bytes
SHA-256: 53014c3ee5b8963d6fa31d59c7c2888f3b48961234cb07d21026e51c654a0bcf
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 19328 bytes
SHA-256: 10e130fd0fb1482daa8550d79fe2b4dc6ac5116c67e47e03ee121e712ef6c769