Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a54f60606ca3b0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 18:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be66bfbde1143f66cf826e6b2ff384fe SHA-1: 4f80ef153f1bf7af9ddfa5fc4d2f35d4c42a2f59 SHA-256: 21a54f60606ca3b037f3f04b80f3d3724ca6907b8eb7c7bd0afd6d49daa36f32
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://stellarp.com/userfiles/files/bivokudi.pdf In PDF document text
    • http://as-eng.biz/userfiles/file/66241048542.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/6559229757.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/52333919815.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/67913838529.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/debunoximatogebupela.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/zekomo.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/19485428168.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/99971220660.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210915204520.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/binejewikuzulad.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/livitedogikevixakaloteki.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/gogilebivomatavozij.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/josapozowagugegupuko.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/25877382777.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/23699765075.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/63895246127.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9994ec9c1---69355794368.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/nezoxanipunib.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/12151431535.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1d58307f---galawolajorusilojam.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/vevexisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=alice+and+wonderland+book+pdfPDF 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_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 10644 bytes
SHA-256: 9a21b5867dd7da612533140b92232f57ebc2a53201aa4c04a7701ca4ae2185a1
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 20160 bytes
SHA-256: ebf853fcdeab065161aaf486ca1009243e0740cbdbc9b8ed4b710b1081030f5a

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