Malicious PDF — malware analysis report

Static analysis result for SHA-256 c659bbf941e96e3a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-27 11:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29198839f099b2e64de3ee585256b712 SHA-1: b24d32bdbf54a53ce12726c02105289ce2589e80 SHA-256: c659bbf941e96e3acf511d7930f695b9815bfff57fc839fbf5b610d381b4e8e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point to a pattern of redirecting users to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://christopherdallo.com/file/48190532577.pdf In PDF document text
    • http://www.beautyvogue.ch/Files/file/zukuxip.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/22619333062.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/83722276336.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/12399479671.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/xipis.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/26655647639.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/pidorujizifo.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/33173651220.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/28436055214.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kolunasupalesa.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/numalebosilofiludujiva.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kemaredopur.pdfIn PDF document text
    • https://blgjad.com/upload/files/11479470420.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/wogaxeribefugep.pdfIn PDF document text
    • http://a-pluset.com/userfiles/guponebilivepatubexez.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9402e778712684ad4dd878ffbf35a277/xudifenilowobu.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/bolumunizubefasezibo.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/ravibudibakedaf.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/ronovuzerulutuze.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/rofagivuwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=meilleure+appli+randonn%C3%A9e+androidPDF 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_off0000bbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 10368 bytes
SHA-256: 5badd5907192c79dbb07bf1913be99d1ce26c72ab52d56ffac2ef82a9700c0ff
font_02_sfnt_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 18984 bytes
SHA-256: 8ed8287a240ecafa9514c8744791238742d88142f5bd4633b24c7cfdde4a1b78

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