Malicious PDF — malware analysis report

Static analysis result for SHA-256 649f7d5303c1370f…

MALICIOUS

PDF

77.8 KB Created: 2021-04-28 20:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb3877016a116f087204ab36c7d80c50 SHA-1: 9d2a74aa14371c1246531a2eae599a76c1155768 SHA-256: 649f7d5303c1370f862ae4472f08e62e7651a4cb848fc32bb1305b9c849b439f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=fire%252Bice+boston+ma+02116
    • http://vitrinachel.ru/madixeu9exq.pdf
    • http://ritixibetono.mygamesonline.org/stephen_king_golden_years_movie.pdf
    • http://hdsamara.ru/241046320564pc8y.pdf
    • http://mebelintera.ru/think_of_me_phantom_of_the_opera_violin_sheet_music_free6ltoi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rogomore.myartsonline.com/kukima.pdf
    • http://dudogiv.rf.gd/kenobizu.pdf
    • http://wetoxisifogif.epizy.com/dominio_cientifico_ser_bachiller_2017.pdf
    • https://s3.amazonaws.com/tawovojo/brand_identity_mockup_template.pdf
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_bc49efb90b2a455f8a7378452e4001ac.pdf?index=true
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_908724254e83427080a61f64a12b3152.pdf?index=true
    • http://xupudajiwozov.epizy.com/92524499600.pdf
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_4f68168ff51742989146d9ae966b9923.pdf?index=true
    • https://s3.amazonaws.com/norozovijalu/sanyo_rice_cooker_manual_ecj-d55s.pdf
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_de673c8f481348c3b14c129c49ab79fc.pdf?index=true
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_3d1b3e532d424e9f8f04997e17a2a5a2.pdf?index=true
    • http://vixadit.rf.gd/7681916491.pdf
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_abaf10b264634a8292b85c6632f6793a.pdf?index=true
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_4a8c9b5d2e27435bada6310e57258358.pdf?index=true
    • http://poxelisenaxoxig.epizy.com/toxidekavivewadeniwono.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7d.bin
ef0396f1beb17cadd73f87e23f7b1a834b627ab2fa45340b003d445358004215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 5488 bytes
font_01_sfnt_off00010113.bin
d1ea9affd3ace4a8c244a0080b679f0ba2b9c766245e5dae5676f139c8a81460		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 11496 bytes

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