Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d511ab6d976dff…

MALICIOUS

PDF

100.0 KB Created: 2021-03-04 07:08:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cd80afe75aee98b06d113820b118f2a8 SHA-1: 36823ff014ef174d88e9a69b879e6f178e4330df SHA-256: e9d511ab6d976dff2b20c8be421cbb6cd7b1182131482dee9c24ce6c976f5c04
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=what+is+the+nature+of+scientific+reasoning PDF link annotation
    • http://wijetaz.mypressonline.com/resumen_del_libro_platero_y_yo_para_nios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_6035480a792f2.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/would_you_rather_questions_to_ask_a_guy_dirty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5fd1c1c1bd750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_60405f048e10b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_600bf2d2af483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403276/normal_5fcfe6b5ae102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_602f4a48add37.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
    • https://s3.amazonaws.com/zuwimadaneb/stepper_motor_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/lyman_50th_edition_reloading_manual_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/does_romaine_lettuce_have_calories.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/indices_bursatiles.pdfIn PDF document text
    • http://rirazito.epizy.com/62463304448.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/sufapakolisoloperufur.pdfIn PDF document text
    • http://siparedobapu.rf.gd/90928272054.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/asus_m4a785td-m_evo_drivers.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_off00013f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F19 5008 bytes
SHA-256: 8aa05420446b14bb3f3114f93622a2e78a81e5d2df99f61b25785bb8b974c12d
font_01_sfnt_off0001501f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501F 10808 bytes
SHA-256: 34dd0ba796278b8ee5c6f91aaf6577e602098a108f6706a1799d51c43efe5608
font_02_sfnt_off00017488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17488 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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