Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f93a5973d92dfba…

MALICIOUS

PDF

78.3 KB Created: 2021-03-14 15:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4cf6fc4d9e7d1276187157271318218 SHA-1: 5c291aa1c372d3031b3be574a08fcb1e39faadf2 SHA-256: 5f93a5973d92dfba2abcb7425bd4c59f526c3e8fe746fdd337d2bdb2c9cfddfc
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm or phishing lure. The PDF structure itself is also suspicious, with duplicate object bodies and external URI references, suggesting it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=present+tense+spanish+worksheet+pdf
    • http://nifazafagikoxa.medianewsonline.com/72648478779.pdf
    • http://bozesedixek.mywebcommunity.org/sawotiz.pdf
    • http://figuxovutofid.mygamesonline.org/ingersoll_rand_air_compressor_model_t30.pdf
    • http://xawegap.mywebcommunity.org/48274241325.pdf
    • https://cdn-cms.f-static.net/uploads/4393790/normal_601290f919ec0.pdf
    • http://futup.ru/mubakunifubgfamr.pdf
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5fdc7110576d7.pdf
    • http://veselutut.mywebcommunity.org/what_is_the_difference_between_hemi_sync_and_holosync.pdf
    • http://xitawefavam.medianewsonline.com/pairs_r_plot.pdf
    • http://ritixibetono.mygamesonline.org/33507052532.pdf
    • https://cdn-cms.f-static.net/uploads/4474987/normal_600eb4bc980e0.pdf
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5fe673e986fdf.pdf
    • http://dkmz2.club/wizegegefulofimuvilt2jwt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_86842aab8a3e4e94b272607ed09a5ee6.pdf?index=true
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_c6a2efd215214420ace83d920fbc0e45.pdf?index=true
    • http://nabenejajoko.myartsonline.com/rodaripuxujezaxasorop.pdf
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_0ec55a8a23a9472aa09c33b762226420.pdf?index=true
    • http://rugoxesoteko.myartsonline.com/pengertian_marasmus.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_df2cb7e9d3bc48b8ae70410c5e06b44a.pdf?index=true
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_9539eda22c55496c91b674402eb7f341.pdf?index=true
    • http://kipejefanowisu.atwebpages.com/fozebegizudanamejun.pdf
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_8a7a33bdba204bac80c44deeb0d9d20c.pdf?index=true
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_6f8736522a9b4bc9808c6007e673427b.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_4938f86bd9e749a2aeecb470b4522907.pdf?index=true
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_67689891a58943b782fe093172682f6a.pdf?index=true
    • 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_off0000f158.bin
c1093f945b35fad6682e1838410855ad8cb1c7ac48219e65463e84e32dfad6e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 5252 bytes
font_01_sfnt_off00010341.bin
cbcfbf4be3610ed82e34aaaad124d832cc16d99f8f24b21943bcbc9e3dc423ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 12372 bytes

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