Malicious PDF — malware analysis report

Static analysis result for SHA-256 43330cbb550d1986…

MALICIOUS

PDF

83.2 KB Created: 2021-03-14 15:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: af4e0028eb870a5aba567e6f84ba5614 SHA-1: 5b76040b3b955ce09e50bff540fa766974cbe8c2 SHA-256: 43330cbb550d198677eda032c96e4328ed963f05e7ff459c7d540aca2e9446e8
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://midufefew.ru/award?keyword=benchmarking+pdf+document PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413458/normal_6038b86e72941.pdfIn PDF document text
    • http://kengoru.space/tofegasekusoqfict.pdfIn PDF document text
    • http://intereriia.com/jijimirowimusobekurvc2q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410214/normal_600641482e086.pdfIn PDF document text
    • http://cmb-accueil.com/bahubali_2_video_songs_telugu_freep9jio.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/uigFQii/dapigobemurofex.pdfIn PDF document text
    • http://agent-spv.space/duo_therm_rv_air_conditioner_thermostatf74s1.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/tiijcjf/uggs_bailey_bow_black_friday_sale.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://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_f09ccb4b4a59460cb7ecbea2bce8754e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/transatlantic_slave_trade_worksheet.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_a2999245bf6947709afa38388cb96c81.pdf?index=trueIn PDF document text
    • http://katiwepu.rf.gd/orpheus_and_eurydice_myth_meaning.pdfIn PDF document text
    • http://gigonusotomofi.rf.gd/gezetomigalurixo.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_754606f972124177a55d2e133acd0671.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/litunux/vasugajivewoxajumusopo.pdfIn PDF document text
    • http://josapug.epizy.com/8410258752.pdfIn PDF document text
    • http://befadiw.rf.gd/gudojuxaf.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_f74eaa68dcff4c3faa5814f5cf899b4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuxegu/pejawefuwafazumu.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/toxepexafizidekudadoboloz.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_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 5352 bytes
SHA-256: 912fd2f482a147b4d3155fe56fe80b70094c5e197c0b2309802effe506ba764f
font_01_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 11180 bytes
SHA-256: a8f31bd2d66eac4cecdbd4629d76e681f165d0d7c6de898dc37e2d240d75d7fe
font_02_sfnt_off00013177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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