Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e19f47c2a83542…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 04:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1260c9cd35cbb0ec768cdb38f8f82683 SHA-1: f557508f69189851064e18790e01d66077e9db21 SHA-256: 24e19f47c2a835425e285f2b07a1b16bc3873bdc71b6e68b18047f68d0251c22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ist-lb1.istanajp.com/contents/files/66425554776.pdf In PDF document text
    • http://alarcon-v.com/editor_upload_image/file/50573730097.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/wubepoda.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/73177034964.pdfIn PDF document text
    • http://katela.net/userData/board/file/memigos.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/karekaxijisojilugiji.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d563606324---kovewosotuvirevam.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/zoxirofutim.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/83756370805.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/razuvitulukojapedobamuj.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/64608130026.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/77700990629.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/resomerugolivijumovoge.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/70046886042.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/44816869226.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/24115087385.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/88410403015.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/dapotidiwudejavub.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/26680656999.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/kafujodofali.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/letofurozudafoga.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16137ad01d9799---72445622225.pdfIn PDF document text
    • https://porfic.com/fotos/file/bufekipuzibavejoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=view+hidden+profile+on+instagramPDF 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_off0000b27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27B 11000 bytes
SHA-256: a001ed27d97087e152036a91e573b5c550e1eda8d981742e1d30f3026b753433
font_01_sfnt_off0000cbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 17164 bytes
SHA-256: e7556590a91ab6daa566fdbcb2264096b980057dc1fdb3055a4c879e056e4b90
font_02_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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