Malicious PDF — malware analysis report

Static analysis result for SHA-256 333fae96d25d75f1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 12:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31424fcd54128ce23e145e56caa5293e SHA-1: a2872a9ec8553d521f82b5ce02148a6bf255d04e SHA-256: 333fae96d25d75f127d92e44fe9d5a3036dc71f4c70bb9d5a9e4883a5948a13b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, one of which is explicitly identified as a potential link farm. While no scripts were directly extracted, the PDF structure and the presence of numerous embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://cee1968.com/ckfinder/userfiles/files/vawedavugokugisele.pdf In PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210906_93FE5AB07F2C6582.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091018032573499.pdfIn PDF document text
    • http://naviway.su/upload/files/95174629779.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/73026723550.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/34971359099.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/domisasepanevasomidege.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/fosiwumoberut.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/69491372136.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/letol.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3eb6823fa---43326877501.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/58259566042.pdfIn PDF document text
    • http://rapet.hu/files/degugipasiwivo.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/69741526501.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109060926081359.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/83029291778.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/340434462613568ffbaf6d.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/jovimisejoz.pdfIn PDF document text
    • http://packturf.fr/files/96319843385.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/sijesijeduwezozodov.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/jewoxofozumojotesed.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/87898886079.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109041111371730.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/tesoto.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/sulevukaxerikewakol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+video+call+to+pcPDF 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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 10384 bytes
SHA-256: 725089ae32a721bca7d096a9ebb0884fa0af1c14edba0c6c2929e539d3fc7eee
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 17272 bytes
SHA-256: 44c993131815fc049b4a1824db92144f0fbe2b34930bf6ca2f35957927f777eb