Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ea1e3960fccac6…

MALICIOUS

PDF

109.1 KB Created: 2021-10-05 15:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5885631bfac72cac7a9796f00bd85830 SHA-1: 6ee03b21de2a7e2d37696c39a1563b1a125b7406 SHA-256: 08ea1e3960fccac6028bd3553e1fccdeb402981e2deda30be6d40ae3a90f61d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to malicious content, likely phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://factorycontrolprojects.com/userfiles/file/dowaxixolafobitumur.pdf In PDF document text
    • http://beastyenergy.com/userfiles/file/97511019374.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/kezavosafesotuso.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/bda793c671d7f40eefbf290c64bc1040/vofusugupitevuv.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/18013577519.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xuname.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/2695667568.pdfIn PDF document text
    • http://slsnn.ru/content/file/91626275210.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/67465805529.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/xowulatujetoj.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151a26938367---jefoloxefovas.pdfIn PDF document text
    • http://slsnn.ru/content/files/vubumujusimajak.pdfIn PDF document text
    • http://tiquital.com/documentos/file/49035570736.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/11272419632.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210906192015.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/49978286396.pdfIn PDF document text
    • https://glozor.com/userfiles/file/jixanonesurame.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/55613586881.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/sizas.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/26680660978.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/wizaduruzemarebafatel.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/61248358453.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/vefetodux.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/96010390347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=iseaco+fortune+vesselPDF 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_off0001403f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403F 20448 bytes
SHA-256: 7b75d760e8ccfe4e792ddc28b58b67668512227bb42228f5a8bfbac370ee6980
font_01_sfnt_off00017509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D20 10352 bytes
SHA-256: 6d9f392d09333d130590885bef79ec22a9f59a76f3b8303e4db8e7adbac1feb7