Malicious PDF — malware analysis report

Static analysis result for SHA-256 667675906d7a0beb…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 19:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a468d5d99b36bc61b20df3e9605d8c76 SHA-1: 20416a2d5df7cf42fe0ae60432178bc90f6e6ef2 SHA-256: 667675906d7a0beb044d9268eeb7c39862278c698c1c9f3fcb35800dde969cf8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious with high confidence. It contains a large number of embedded URIs, many pointing to disposable hosting, indicating a link farm or phishing lure. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose. The presence of numerous external links suggests an initial access vector via spearphishing attachment, leading to potential drive-by downloads or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=tom+y+jerry+movie+2021 PDF link annotation
    • http://elma-itc.ru/!upload/files/jobonajaj.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/81760066835.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/rezilatunelidob.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/tametamigiwejuvamixa.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/noxukezil.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109112311254857.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/6298252231.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161362998c09a2---44793878567.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/ponug.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/rizenepixajogitozevisiba.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/mumatajuxuruzaliroxogosu.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/pilagufisonep.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/10773323039.pdfIn PDF document text
    • https://ocw.tw/uploads/files/16922385858.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f3a35f15---nevebotobizavuruwes.pdfIn PDF document text
    • http://cartopack.com/Images/file/naluve.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/26191018227.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/85889693120.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/towajukipe.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/56568590688.pdfIn PDF document text
    • http://e-sheremet.com/img/sepoxuxotibi.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/vapinivige.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613c05af37308.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_off0000bf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0C 10260 bytes
SHA-256: f91150738cf1e934f29cbd3ccbe627126151177bccb0fec059f463642983117c
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 17564 bytes
SHA-256: 24f7a3b00011177638cf17fc74dc54d812b7a539538f83bddb8b186fb82df731
font_02_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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