Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cc061d127b7797…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 21:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c808a02601ccde9c95bf5cc330bcca61 SHA-1: 299fa07cbb201526a0a429c6c3b3935acbf54ed3 SHA-256: 41cc061d127b7797c7c6807bf633b809452f7ffdcd2cd69a4a8beac76207939f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model returned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/05d32d75c9d4b59fc3e08bcea5bff5da/2839045952.pdf In PDF document text
    • http://wsystem.sk/userfiles/files/52563511064.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tedop.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/96053615563.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zuwolemijaxulo.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/fanugogezifimepukotaza.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/32848997775.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/80888291634.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/fogexad.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/67844183784.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/31220271168.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noxexijatem.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28318291568.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///dapexabo.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/64050949643.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xirewumose.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/nasoxuvuxojeki.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/95428418554.pdfIn PDF document text
    • https://avflash.nl/upload/files/sosoxemafonivilibegi.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kikirozimixavexositifo.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/4800659467.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109020719364284.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/61547332585.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/xanaxim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bollywood+burglary+read+onlinePDF 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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 17696 bytes
SHA-256: 57eb513a2422d7988181284067b9ef2b292018f438bbb4ba6c26ebdfc9719341
font_01_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 10652 bytes
SHA-256: f10b204cecafcf5c11a3b3f01603b0ca8a149a824f2d530a4877b8af6fdd5cfc
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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