Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e08f3eedd083d0…

MALICIOUS

PDF

78.8 KB Created: 2021-05-28 22:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8c99b7c1f33f42f30b5db8728b78dc7 SHA-1: 7c816197ae2e493e71937c8c59f1033bbc2db7e8 SHA-256: 69e08f3eedd083d08215b11916bf4c77c154ae82ecfdd811b59f8da7c6f2c98e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=oromiffa+english+dictionary+pdf', which is likely used to host phishing content or distribute further malware. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', reinforcing its malicious nature.

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://resalured.ru/strik?utm_term=oromiffa+english+dictionary+pdf
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/aa5537be51b.pdf
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/6711548.pdf
    • https://cdn-cms.f-static.net/uploads/4367959/normal_603af0087e663.pdf
    • https://cdn-cms.f-static.net/uploads/4486054/normal_602b0c3392554.pdf
    • https://cdn-cms.f-static.net/uploads/4403541/normal_603cb8e4c72d1.pdf
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/4e7cf.pdf
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/2ed55cf008e55.pdf
    • https://vupikesuxal.weebly.com/uploads/1/3/4/3/134397623/8787041.pdf
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/863320.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b1e043c2-7468-4ae5-8374-9c030ddc4182/74559008692.pdf
    • https://uploads.strikinglycdn.com/files/19e57325-d5f3-4501-872e-a7263195648e/26591181109.pdf
    • https://uploads.strikinglycdn.com/files/a19bf746-a5b6-4177-9e1d-5ca4c5dff54b/21431212787.pdf
    • https://uploads.strikinglycdn.com/files/6682f322-cc1f-450c-a4ee-39e371e6e486/25785398431.pdf
    • https://uploads.strikinglycdn.com/files/afcac239-30b0-4255-9730-0f428f5936c9/how_to_calculate_the_area_of_a_triangular_prism.pdf
    • https://uploads.strikinglycdn.com/files/f63388b8-94f2-40a0-af5e-fbccee819192/similar_triangles_practice_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/ddc786b3-b260-4edf-ba5f-9b1c74671a8d/parabody_ex350_replacement_parts.pdf
    • https://uploads.strikinglycdn.com/files/cf1c4fde-1cbf-4a4f-8166-a7c49d3c61e9/18947528078.pdf
    • https://uploads.strikinglycdn.com/files/812fb0ee-5f8c-4dfe-824f-97e4258f67cf/how_to_change_rainbow_six_siege_name.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_off0000f5cc.bin
6b41bf34e241dea00be99a7f60f259eff390bb66d550209518a485a9bbdb55e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 5700 bytes
font_01_sfnt_off00010907.bin
3114fffcca4efb74574577680ca0087d8d65596877a697b3e02acf924174a1f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 10736 bytes

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