Malicious PDF — malware analysis report

Static analysis result for SHA-256 e517ed835def99d6…

MALICIOUS

PDF

73.6 KB Created: 2021-03-27 23:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31818bc23c4a00a466d57ef0284c8d79 SHA-1: 14916dd7efe6c5e2f3c91a10f44a47c448d29536 SHA-256: e517ed835def99d601a6c4d9a59a4010a1d2b31e412839ba4c56dba1ac9a4ffa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=beowulf+characters+pdf
    • http://discount50.pro/beauty_salon_special_services_2016cbjgm.pdf
    • https://cdn.sqhk.co/fabadipub/jfaFGMD/linear_quadratic_exponential_models_worksheet.pdf
    • https://cdn.sqhk.co/womawuxinuge/V95jfmW/70624712729.pdf
    • https://cdn.sqhk.co/dukasavubu/gfxFjfh/fulawiguzebobubep.pdf
    • http://servempieza.site/sam4s_cash_register_sps-530p966b.pdf
    • https://cdn-cms.f-static.net/uploads/4425010/normal_6009cd4407f07.pdf
    • https://cdn-cms.f-static.net/uploads/4490272/normal_5fd60dbdc37e9.pdf
    • https://cdn.sqhk.co/fuvebopeweb/EgiyJoz/31497655281.pdf
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5fe2d1377c9e7.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://cdn.sqhk.co/murafabu/6heFqib/crazy_halloween_party_ideas.pdf
    • https://static.s123-cdn-static.com/uploads/4501198/normal_5ff3f795d2636.pdf
    • https://static.s123-cdn-static.com/uploads/4470841/normal_5ff5f37a0600d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_9afe8e7a62f048bb8ee7c5fe917e1e0e.pdf?index=true
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_27b42f421ee34a49a2b87762fe7788a7.pdf?index=true
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_6bfb28a59cbc4ea7a48de5ac1937db75.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_ff5b68322e6a4471a79eaf609aada668.pdf?index=true
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_7692ff493c3d4c9ca2e05493ca00e907.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_off0000dec6.bin
109aa229304f207e4b745f731060fc64231a41a97e6dc5df77ef41af592a8b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 5384 bytes
font_01_sfnt_off0000f128.bin
48871de6a6fff00a5470efef5b8ac31e547a0af5b3509a6c9259628f2f3d828c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 12568 bytes

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