Malicious PDF — malware analysis report

Static analysis result for SHA-256 d764c6374a153125…

MALICIOUS

PDF

61.6 KB Created: 2021-04-05 13:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca92c33c7a24fe6cc2f686879f9a8c6 SHA-1: a02c1e261b215ef912c9baad9419f6de3719e8e7 SHA-256: d764c6374a15312539e7ca6c76deff8b6423663475286879a2529214a8703fd7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, indicating it was likely generated programmatically to appear as a worksheet, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://maypoin.ru/wix?keyword=the+secret+life+of+the+brain+episode+3+worksheet
    • http://jakusavu.sportsontheweb.net/fexofiw.pdf
    • http://freehookup.xyz/pablo_neruda_poemas_de_amor_largosrqf56.pdf
    • http://kersita.fun/335246385928lcml.pdf
    • http://meetchambre.xyz/goldline_controls_aqua_logic_aql-p-48temk.pdf
    • https://cdn-cms.f-static.net/uploads/4378175/normal_602e144fe4ee3.pdf
    • http://kadabafomelu.66ghz.com/bovidufelixuxepud.pdf
    • http://gawudubigojan.getenjoyment.net/ejercicios_resueltos_de_molaridad_molalidad_y_normalidad_quimica.pdf
    • https://cdn.sqhk.co/runudori/63KjfpS/pipaxomegemikavanegosu.pdf
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5fe3e8f0adc0c.pdf
    • https://cdn.sqhk.co/sawibevas/m9xUKhj/54334175208.pdf
    • http://radanews.site/taxejegario05v8.pdf
    • http://wrinklestiltskin.com/numberformat_two_decimal_places3bdpy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buxidogekalor.rf.gd/books_written_before_1900.pdf
    • http://tadezaxe.rf.gd/roxonexizumakizuwida.pdf
    • http://juzavogubi.rf.gd/lemenipagalegaxijotexaba.pdf
    • http://rorolavosi.rf.gd/61214840704.pdf
    • http://bivuraxut.rf.gd/android_store_app_settings.pdf
    • http://guvamimifufirar.rf.gd/new_testament_apocrypha_download.pdf
    • http://kajoxuf.epizy.com/molecular_cell_and_developmental_biology_major.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b989.bin
7b73ef986cc1d097b381f15489aa072a4b11389236c0f46d24bb38ef1eab2e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB989 5652 bytes
font_01_sfnt_off0000ccc9.bin
70f00ebff4316919637af04bfc37912a2176fbea1d56b556d7d87ea0d511d65c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 8532 bytes

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