Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a83eece58e52ee…

MALICIOUS

PDF

80.7 KB Created: 2021-03-08 05:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aff99695eff85ec3804139dfdaeb9dc4 SHA-1: 4aad823644d25fab85449500be8258a964be48dd SHA-256: 75a83eece58e52ee9306b3d5b7448e49d36f4cacfe640b35f6c3dbfd46f9d30c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=spartan+health+sciences+university+ranking PDF link annotation
    • http://memowelubi.mygamesonline.org/95643566088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5ffc31f69579b.pdfIn PDF document text
    • http://punejew.mygamesonline.org/zovod.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/djcjaha/91669507677.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/DKtqhii/line_puzzle_string_art.pdfIn PDF document text
    • http://jovasetiveduza.scienceontheweb.net/62702460808.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/tawetunisuzomun.pdfIn PDF document text
    • http://vumajepipixoju.iblogger.org/internal_combustion_engine_by_rk_rajput.pdfIn PDF document text
    • http://pesetatin.iblogger.org/what_is_the_plot_structure_of_romeo_and_juliet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fe82713e6ecd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dudaturid.rf.gd/29819362916.pdfIn PDF document text
    • http://rixejobol.epizy.com/49204732492.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/the_kid_who_ran_for_president_read_aloud.pdfIn PDF document text
    • http://sajavisazoz.epizy.com/reflection_refraction_and_diffraction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369c6e04-e035-459e-a01e-9b7541e2e16d/can_an_evaporation_line_be_bright_blue.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/vobina.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/ap_english_language_and_composition_2020_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00e7b2b-ff86-4289-9cf7-052569144faa/movafitazunamonaxexo.pdfIn PDF document text
    • http://rusuxagek.rf.gd/free_cacti_0._8_network_monitoring.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 5296 bytes
SHA-256: aaae871a348c51feb8b37be4de34b24070551b3f411b6ee00a2be195ffb9cf09
font_01_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 11992 bytes
SHA-256: 21dd50a28a9fc4f42987ce8673d1677796f8a81b76f34387d0bfde7e129704f9
font_02_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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