Malicious PDF — malware analysis report

Static analysis result for SHA-256 9923dee95fa0194e…

MALICIOUS

PDF

67.6 KB Created: 2021-09-20 23:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f10b8af85e9f66154982c9d73394fac6 SHA-1: 4c25dc00bbf60f210c7ee7a31f46ae63ab2ae57c SHA-256: 9923dee95fa0194e7d148655b3c5b55d4c9f74e337ec5a3bdc742197b5c294c3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or low-reputation hosting. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed as a link farm or to redirect users to potentially malicious content. No scripts were extracted, but the sheer volume of suspicious URLs points to a likely phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://cructi.ru/uplcv?utm_term=history+of+trigonometric+ratios PDF link annotation
    • http://4els.ru/uploads/images/files/tukirurijunopesurobubo.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/rafag.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/21274994951.pdfIn PDF document text
    • http://askaudit.ru/price/71192449534.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/79451926363.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/2570479034.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/43490365546.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161366fe25b52d---kafebazej.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/88046489779.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/6365765376.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fidafigagefogijodipo.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/raramusofifupuzi.pdfIn PDF document text
    • https://iword.de/userfiles/file/1033026988.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/kukefamafetimatatekus.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/wogofojalekefurepumi.pdfIn PDF document text
    • https://vleek.com/uploads/files/voxutu.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/44979216826.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/53175908253.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad57015e---xaruv.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/mibijumipom.pdfIn PDF document text
    • 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_off0000aa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA37 15028 bytes
SHA-256: 4f8ca588d4847e29561e05d67c2e533ae3fb4759f6a91a16f7025f4163dd678f
font_01_sfnt_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 10740 bytes
SHA-256: 4b7a383627380bdfb42f5c12c15b0dd0cf71d5197189814044c5951c68e25015
font_02_sfnt_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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