Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ecaf0d94795c81…

MALICIOUS

PDF

82.6 KB Created: 2021-04-05 02:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f2f412ae8afff44198f65a700e8871c SHA-1: 410ba5c30832d06e9612e44e6b7237d219ec608d SHA-256: 17ecaf0d94795c81a79e3d298fb6390eff2dcbaa7648d36a2cc9978fa891a7da
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=axis+and+allies+1914+strategy+guide
    • https://cdn-cms.f-static.net/uploads/4465259/normal_60417b0393021.pdf
    • http://tokepubex.getenjoyment.net/woluxemudomo.pdf
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fee80194f7c0.pdf
    • https://cdn-cms.f-static.net/uploads/4374682/normal_60673def500a9.pdf
    • https://cdn.sqhk.co/mozejipakas/R5H1PKv/zabiduxomiw.pdf
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5ff346657c834.pdf
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5fe2860ab94d0.pdf
    • https://cdn-cms.f-static.net/uploads/4456389/normal_60651e72e9bad.pdf
    • https://cdn-cms.f-static.net/uploads/4470679/normal_60179f444afd9.pdf
    • https://cdn.sqhk.co/wubunepan/bEVjjZZ/tnt_run_plugin_pocketmine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_3411b7da7385453eb89e44840fa194ca.pdf?index=true
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_bdf623b488da4e31b9fdb2a705ee59b9.pdf?index=true
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_ba4fc42c47bc48ce9fbc224b546b67ef.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_5a5ddd05fa6f4b7588688ec1ddd527cc.pdf?index=true
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_160261c4e175465e959d6bc73ed6ecc7.pdf?index=true
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_d48c8fc8584f4c0a989d5955b7cbb3c6.pdf?index=true
    • http://fubavinexazixo.onlinewebshop.net/angle_of_repose_in_pharmaceutics.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_f79874c8d99a4d5f9a7763af1f296551.pdf?index=true
    • http://sulorowanutabu.atwebpages.com/xobirevoguluwo.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_off000106a1.bin
495d77c8f3909173e1147d87b413c7d51fd50c039bc670c7eb01b55b86a4c82b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 5448 bytes
font_01_sfnt_off0001194c.bin
9fefacfd38b4f7da4a638df3d1529097833e9ed8e51bcbd9b2ebc7679e165309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 10368 bytes

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