Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ea514fbc125078…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 17:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a247a440b4d807e3adbae18dad2eed15 SHA-1: 85ce6b677956fcc2228cad383ccfe453f92c09c4 SHA-256: e1ea514fbc125078af0d1fb76bf7183bd72e062188fd0d04e4a9a4d8a593bc23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or spam campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://fu-xin.tw/uploads/files/202109140813157619.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161451c20921cb---31086482060.pdfIn PDF document text
    • http://insei.eu/userfiles/files/lonuz.pdfIn PDF document text
    • https://digiconelectronics.com/media/lawegipole.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/51884294060.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/fijelosikopapakad.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210916000510192.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/tazosa.pdfIn PDF document text
    • http://wernitznigg.at/files/52326011154.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/masoxelupawupizep.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/rezije.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/n34r5m2n6scbmr7gj8oevkb5lq/90905142030.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/55788735123.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/22592228347.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/tababopulo.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/30458553256.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/66091166006.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/40466409012.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/mujobo.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/21090415041975482806u7g.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=uninstalling+updates+on+androidPDF 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_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 18088 bytes
SHA-256: 2a8f912f47b2e506622fd32da067a711e38dc1293974af9faff6ca3db54f6a7c
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10676 bytes
SHA-256: faed646535c8dd53382802757760124554b650548c2ce9ce1f732b96571b1a85
font_02_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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