Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd6260d64388493…

MALICIOUS

PDF

69.9 KB Created: 2021-09-21 06:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab8659b91a519472bf259c21eaf8bb57 SHA-1: f931548177273d376f56dee94ad0dcffc8465fa8 SHA-256: bcd6260d64388493e18bfc70ab178dcbebef1426e6faf4a64816f07e2b8262bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially malicious domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://pixomot.ru/uplcv?utm_term=kr+version+apk+download PDF link annotation
    • http://tayles.com/uploaded/83567436586.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/92225861317.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/66610374354.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/25992676324.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210918180612_zhnpz1.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/pukiwutiminolit.pdfIn PDF document text
    • https://petikdaun.com/contents/files/71320283487.pdfIn PDF document text
    • http://cssh.es/img/file/vavubet.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/63323184847.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tuneles.pdfIn PDF document text
    • https://vientangluc.com/upload/files/14324848446.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/ligas.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/8403942588.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/rilidorijijatuzaduv.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/97589366300.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/622aa52386d4cba7b7a8d738c2e0b63b/95574473127.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/43031983731.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/makiparopa.pdfIn PDF document text
    • https://onecre.com/images/content/files/67114388412.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/gejinidokimuxozeliwevaz.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/13130375629.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/kunixipa.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/jugalima.pdfIn PDF document text
    • 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_off0000b15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15C 10524 bytes
SHA-256: 798d96405ef40fcb8ebd48013b72934f3389fbd37279275e53736d7eb54367be
font_01_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 15900 bytes
SHA-256: ceb6206d67f2e2e0e92d706cfeadd40d3f425f1cc3a5db2db9fe1dfa185b1cf2
font_02_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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