Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace254cf8f6c5d9e…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 16:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f01b47cb57c5f92bd96e3c129d00961 SHA-1: 453b7f2195eebb3b7c4f623c3de3317d5280e1ce SHA-256: ace254cf8f6c5d9ebdc2664618e872bbd319ef3b38a4287c8187f7efd550c868
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://zjgyuanhong.com/v15/Upload/file/2021919154235819.pdf In PDF document text
    • https://servingltda.com/userfiles/file/xadijovovuv.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/pifanusapa.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/jitutubezokixomefejeg.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/88043454338.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/vaxotoxik.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9d246a34---gotubus.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/48485915388.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/22525470037.pdfIn PDF document text
    • http://blccy.com/userfiles/files/bijurofofore.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/noperopatujidopaz.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/jujiregamibasazefojud.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/dozunij.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/texexewuxome.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/zisosewavebizoligusepode.pdfIn PDF document text
    • http://tcihk.com/userfiles/lenim.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/10323251126.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161429592f10a6---34131286533.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/7537832116.pdfIn PDF document text
    • http://qdjshg.com/files/file/96922987841.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/28159774726.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210926_76210C3CEE0E3181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=a+quiet+place+2+live+streamPDF 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_off0000abc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC5 10724 bytes
SHA-256: 600bd3c9d36c9e134a0db103a7b485bcda28ddc20a805e76df38ad026f90e22e
font_01_sfnt_off0000c484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC484 14800 bytes
SHA-256: b2652a4e5a7d2bbcdf730d4f2aa1148720f1e38beb196c0c80a2e7f66fa9cba2
font_02_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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