Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea246964d5c814c…

MALICIOUS

PDF

93.8 KB Created: 2021-09-23 23:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9cc839204d6e187262a9627da2522d9 SHA-1: 53ad314a21cb14a94da7f3a507c0e8c93844a2fa SHA-256: cea246964d5c814cc11ecadfd54e52cc0d55f888b58651dd462a820b35dd0ad9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are disposable. The embedded URLs and the document's structure suggest an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://yellowmangocafe.com/userfiles/file/19422335556.pdf In PDF document text
    • http://glendale.kopanramen.com/uploads/files/kurorazuk.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/73358876659.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/44051400761380fce93a20.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/13224025285.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/30536633157.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/72638768902.pdfIn PDF document text
    • https://2acontractor.it/images/file/limilekipenigijopirakowog.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/giduligadesini.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/68406526735.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/44190978727.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613595803aefa---29208880012.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/96369454986.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/71220323734.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/pateguzibepiwobizaza.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/kofifawapaw.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/25443858924.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/2239893831.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/lubawo.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109062203536178.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/98297086485.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/46813342331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=instagram+followers+online+viewerPDF 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_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 18416 bytes
SHA-256: 8a9838412dde95158ec22ec38ef77452d85dac56021db9f2fa75f19996f50d75
font_01_sfnt_off00013939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15150 10660 bytes
SHA-256: f190d8535438ed3ca3344e9ba613c0aaf510e5c95197e01fd37b15f821cd3884

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