Malicious PDF — malware analysis report

Static analysis result for SHA-256 86eaf3b19c35cbfb…

MALICIOUS

PDF

85.6 KB Created: 2021-09-14 15:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7cae80ca23f3d388786d7aba7767131 SHA-1: 21f78fd017bb02d46f4aaa75278455da86d06f4d SHA-256: 86eaf3b19c35cbfb30ec624f5b922b3f1ffe79f39f529ca04a9111fe51469b26
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on potentially untrusted hosting to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://medizator.ru/ckfinder/userfiles/files/vivepekokuxulo.pdf In PDF document text
    • https://bongkartuantakur.com/contents/files/neposowota.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/venepapapuwuzopewanijira.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/loximoraxugajumuxirej.pdfIn PDF document text
    • http://fluorescent-training.com/file/63827007468.pdfIn PDF document text
    • http://ruihuitax.com/files/file/83959612362.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f002c36c2b---63254345495.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/gulagoxudoladapumali.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/25292014059.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/pivagivuw.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/sokavubofaman.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/36721692044.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/30356176246.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/retegasusijewojotosekozol.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/tekiv.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f1189d79---kusozifinimujap.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/dinal.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109070925264598.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/jofaberodeweregafiwuditu.pdfIn PDF document text
    • http://polkovnik.su/upload/file/nokebejisom.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/pufawurolaxikif.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/60979023184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=reading+and+comprehension+b1+pdfPDF 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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 19364 bytes
SHA-256: 92e56663a46f58560d049dad81f5d8bea311bf315eaa6f04eb7d6a88db9f3e1e
font_01_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F21 11160 bytes
SHA-256: 181ee9724e720b5cbb4853edc35b142458411572e1629843ae6451475bb9c822

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