Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01a72a626bf8eae…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 19:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 088f8cf6b174f25cd1bafa2376c5ddb9 SHA-1: 92ea61962364d1bb8d09c94d9f505af6e25e7c82 SHA-256: d01a72a626bf8eae87399e3f0b261949f029a9f44970e16c915746cdfc8ef9d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=pokemon+tcg+mod+apk PDF link annotation
    • http://etkenkalip.com/files/falagunazani.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/fixef.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/sagafobigavajetofapijuwix.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/77836609292.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/30653887106.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/susowuxixas.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/94139819937.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/95559613674.pdfIn PDF document text
    • https://shunnasato.com/zaxedosixixogejasuwovafa.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/disadumuberidowuvetonenos.pdfIn PDF document text
    • http://deforma.it/userfiles/files/wuratap.pdfIn PDF document text
    • http://shesob.com/file/files/58172201661.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/67233218547.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/defag.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/doralagu.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/89224129157.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/tufinovejosovobow.pdfIn PDF document text
    • https://artbynela.com/uploads/file/noxapuma.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/94045039504.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/54504550484.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/14042699171.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/bopudibizanas.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/pofafi.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/87972752433.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_off0000bcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 18000 bytes
SHA-256: 7a6279087bad72f2160fb3ac03f40326860b6eaf7c351957b924f9b348e2e9c3
font_02_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 10544 bytes
SHA-256: 062e399e77d0ad548e9045323d98e493cd8a2a34fe80739adb2299f5ea8f52df

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