Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9b1b3020f4d419…

MALICIOUS

PDF

80.6 KB Created: 2021-03-24 15:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1a3df9f701c626abc86c54889e0cf9e SHA-1: b402e2a6dbe2ff2417d2e9c61229fd06f68e513b SHA-256: 9e9b1b3020f4d4194d895bfd22f712c28b490fc4fd967338960b312132b6c80a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of many external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=linux+%252B+study+guide
    • http://beritox.medianewsonline.com/companion_to_analytic_philosophy.pdf
    • http://zasazigupat.getenjoyment.net/12037348621.pdf
    • http://wipebodu.mypressonline.com/67881164794.pdf
    • http://help-lnstagram-verifycopyrgiht.com/lekimiwolepitagoligowovisrm3dy.pdf
    • http://vebifitapex.mypressonline.com/here_comes_the_sun_fingerstyle_tab.pdf
    • http://noksipals.online/symbolic_logic_irving_copisxprg.pdf
    • http://xodaxedepapopox.mygamesonline.org/27130880824.pdf
    • http://zozavelomidabi.scienceontheweb.net/gofuvelubuletutowuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/97c5b385-a596-44ae-b78d-06a8157edc87/whirlpool_cabrio_dryer_parts.pdf
    • http://fetapewifug.epizy.com/tigepasidalim.pdf
    • http://visevagopar.onlinewebshop.net/caribbean_recipes.pdf
    • https://uploads.strikinglycdn.com/files/2436e905-29ed-4465-a77d-9c6268aa996d/unshakeable_tony_robbins_book.pdf
    • http://zogosugo.onlinewebshop.net/85693344438.pdf
    • http://suwuxuk.epizy.com/1950909085.pdf
    • http://peruroz.onlinewebshop.net/sbi_green_card_application_form.pdf
    • https://uploads.strikinglycdn.com/files/e4d52bbe-a5b3-46db-b36b-c09919c03a11/maya_banks_kgi_wherever_you_are_read_online.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d5.bin
4294b9ac64b85daefdaf2f0cb2c6460f3eaed0a8787e1bcf0dcdba9ec830685d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 4536 bytes
font_01_sfnt_off0001015a.bin
014d9963a74fddecc2404020ed5fe291cdb03e08ef1df2d179e23efc7c7142be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 11280 bytes
font_02_sfnt_off0001279d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 4324 bytes

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