Malicious PDF — malware analysis report

Static analysis result for SHA-256 af650289fabf63d9…

MALICIOUS

PDF

85.5 KB Created: 2021-03-09 21:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1368487e322c52497664c11616137733 SHA-1: c4bcf840089f87bb30292029c3b90f26881fbfb4 SHA-256: af650289fabf63d9cba53f19871844b8dd1dc018931fbbf45c718d1f854c6509
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that lead to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to educational materials to entice users to click on these links.

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://leonvi.ru/award?keyword=reading+and+writing+skills+grade+11+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5fec4154c9ba2.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/Vgd8QbI/xuzagiperiw.pdfIn PDF document text
    • http://getyourscore.info/hp_d110a_wireless_setupfa0ks.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/passport_9500ix_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5fd7d9182845b.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/htgiSK5/tie_dye_sweatsuit_outfit.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/Fjhghie/oceanhorn_2_review_ign.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ff8fd81a67e9.pdfIn PDF document text
    • http://netunesufugu.22web.org/ravosu.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/three_phase_boost_pfc_converter.pdfIn PDF document text
    • http://bella24.xyz/big_data_analytics_tools_tutorial1j4xk.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://bolunivagoxel.epizy.com/video_lirik_bts_idol.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_998865b2b17141ed9e1589ce6435313f.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_c79c6bc676824fbda2b84ca390add4cf.pdf?index=trueIn PDF document text
    • http://mivogunav.rf.gd/multiplication_and_division_printable_worksheets_grade_3.pdfIn PDF document text
    • http://bexobiku.epizy.com/what_is_2_pounds_of_sweet_potatoes.pdfIn PDF document text
    • http://tigesafapowe.epizy.com/what_are_the_requirements_to_be_a_secret_service_agent.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_fb1747799ace402da35e1fb5f6e00a5b.pdf?index=trueIn 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_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 5352 bytes
SHA-256: a78b4c77f562461ac4dea0b67a9c4365a50d66b44d539a2e4ea843823c757165
font_01_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 9824 bytes
SHA-256: 8745993bb4bc07a5000a16ce65b5a03b2a4318edf189811b3c99eb03f5cde0ef
font_02_sfnt_off00013aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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