Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cb9110bfc1eaac…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 13:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f3bde5a025d37df5d87df1d0b0fc14b SHA-1: 8a44bfa9003cbbcc57fe12599ab8bda54e7d6672 SHA-256: d9cb9110bfc1eaac8f66f8432e4bb8d18eb5c9b6e21299d9b32bc9ae3454fc86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this pattern as suspicious, often used to obscure the true destination or distribute malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://excitechem.com/userfiles/file/zugewekuronu.pdf In PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/91233850298.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/44617809786.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/vapazewofi.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/11401553235.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/35756829950.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/e1er49hkoja7gfpsf5jtljb2df/67422649048.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed446b0a45---7741486131.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/gidew.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/70658439771.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/terufikum.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132b74148c20---18547024515.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/41134269112.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/lerosekum.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/xumuvemutaba.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210903155826_1501887117.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/navojitenabetuzeg.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/64881607985.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/kaxatutazuzagasujofipireg.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/52780867075.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/71241029017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kanchipuram+theatre+today+moviesPDF 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_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 18568 bytes
SHA-256: 18dd71ef003da0298bfd6888ae6e7c0ddec2423b0b64216f8522fedcf5fb1ce0
font_01_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 11004 bytes
SHA-256: 11df4b83019f95f46cf314df18fc557f9d98da8ab2510a7fae50e254fe8b848a
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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