Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aed9cff7a9d2a7c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 09:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 035fe9afe989b7c6599da1ccfe8ef98f SHA-1: 85cc4db64c6f7f28e0c15fb44baa5d23af8ebc05 SHA-256: 1aed9cff7a9d2a7c47bd329f7c81b7e7f0decbc9cd604f01868db8bc1fae4238
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting an attempt to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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 https://wecareu.net/ckfinder/userfiles/files/86472935023.pdf In PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/3185577733.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/90558590564.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/tolarimosozag.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/73514071325.pdfIn PDF document text
    • https://kede.org/userfiles/file/punugazuge.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/jupababuvukigemufogixox.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/73624328672.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/safatot.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/33582167981.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/81823689251.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/5996288037.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161428b0e53848---63795289733.pdfIn PDF document text
    • http://baove24h.info/upload/files/gexelevurakujurewoda.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/bukulasulinebuneloguva.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/83299942814.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/bekuzitozepasij.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/60473799016.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/gepotiman.pdfIn PDF document text
    • http://master-br.ru/img/file/pevoso.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/83439673147.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/82753155566.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16136ed8f4ba6b---zadapoleduxunaramuwiz.pdfIn PDF document text
    • http://candientuvibra.com/images/file/79744783278.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/53249058597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+send+files+with+wifi+directPDF 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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 10488 bytes
SHA-256: 1dc28238e8ca7f683209dc1f9961fd0811989a85d87129971631b8674f12c461
font_02_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 17580 bytes
SHA-256: f8161c34c0be34ceed887a784fab655b11ace1476d84cb4fd47c7c7960b752a8