Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b9c77f3bc5bf14…

MALICIOUS

PDF

78.4 KB Created: 2021-03-18 21:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: db872df4b72ba3536d6ddccdeff97108 SHA-1: caa12ce241f95f5ecbd7e17022a02f0686921350 SHA-256: a5b9c77f3bc5bf1487914ef252f6ad9929a467f0be97a4f892f8a2675bbbe7b9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit user trust.

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://nipisod.ru/award?keyword=double+column+cash+book+questions+and+answers+pdf PDF link annotation
    • http://xijonofupawulo.mypressonline.com/bsc_nursing_1st_year_syllabus_ruhs.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/canvas_exemplo.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/39526242524.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/gopowaliwonefemuxap.pdfIn PDF document text
    • http://the-glow.ru/84814755362wl2af.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/bodalotolezuzaxoduz.pdfIn PDF document text
    • http://robolab.one/zigozp9js5.pdfIn PDF document text
    • http://nelodorofi.iblogger.org/74424213124.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/ink_cartridges_for_hp_deskjet_f4580.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/86756853101.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/gefojikuxexuburifiruw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15965392-42de-4ac9-a98e-7bc303daeb9c/air_force_football_uniforms_vs_hawaii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b190b8-52c0-4c4d-9d9e-50d3a059903b/how_to_increase_calories_in_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8710b8d1-2ba5-45a3-b88c-250d35a24005/dixotizofagetaduma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958303b2-ba85-4607-a014-7d5c62213d9d/what_is_a_easy_thing_to_bake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5fa325-63ae-4a9c-9239-4faad0af72d2/what_is_an_example_of_a_quantitative_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da360c53-2a79-405d-bf93-e0229503e906/troy_bilt_tb230_will_not_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09016fc6-7418-41bf-891d-123bc8632680/which_is_the_coldest_place_in_the_world_and_its_temperature.pdfIn PDF document text
    • http://tasukifuputuf.epizy.com/cv_design_templates_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d213e297-5b0d-4ad0-a18e-c61d2e80dc96/pixekawunefazopoxugobepin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93fab3c-ad77-48bc-aeb2-d7ede7b365b3/nadenu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 5816 bytes
SHA-256: 87cedea813dcc4859fdb23519f0e14e0f3e8f408e4ac5b3ab25915d5db2c12ed
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 11144 bytes
SHA-256: ea5979f1f8c8e6c6119a79f152c6f4a92a2454bf243de904df8cf4adbc3e5b0e

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