Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec467d4a41a30e15…

MALICIOUS

PDF

78.2 KB Created: 2021-03-27 15:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83e5ad3efa91ca35341eb7397f33f1e1 SHA-1: 53e3d4ee0eae72934f6a5cd95eb0be9da6fa0756 SHA-256: ec467d4a41a30e1566a8eaa6d19e2d83a786f08dfc4668c06d92df949f1c85e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'happy birthday in spanish song', which is likely a lure to disguise the malicious intent of directing users to potentially harmful external URLs.

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://golowaki.ru/123?utm_term=happy+birthday+in+spanish+song
    • http://pagavopalubutu.scienceontheweb.net/batotezexonumibojikonipi.pdf
    • https://cdn.sqhk.co/kinanekoxo/OVje13N/linokexam.pdf
    • http://falorilipeb.mywebcommunity.org/joviwutapobiluvarubupof.pdf
    • https://cdn.sqhk.co/kewawukufiju/ifIihdA/zombie_pixel_farm_survival_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vapite/employees_credit_union_estherville_iowa.pdf
    • http://dufojamimusim.atwebpages.com/fugijukomusomebunox.pdf
    • https://uploads.strikinglycdn.com/files/45078f4b-5bb9-4244-a62e-4e0292b2be59/el_sistema_endocrino_esta_constituido_por.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_46432f33444d4ae7b5b006b731142c2f.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_d86f6b96e1a545b99ce3a9add22ca477.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c69b60be-4d87-4100-bae6-4560af9f048e/who_wrote_the_song_neon_moon.pdf
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_7cc89f4ab7bb4abd933ff9dc49800383.pdf?index=true
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_e429d3cf99f44b7781c0e7231a132aec.pdf?index=true
    • https://s3.amazonaws.com/sisaxu/about_us_templates_bootstrap_4.pdf
    • https://uploads.strikinglycdn.com/files/9e53e7ba-fba9-484e-800b-995dba8fbdba/painting_ideas_with_a_twist.pdf
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_5b0fa75307724fbcae55f2c36c587c8f.pdf?index=true
    • https://s3.amazonaws.com/jarawaxanivu/diretikejenen.pdf
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_d0cd23ab3fbb428db89d0f2943718a69.pdf?index=true
    • 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_off0000f348.bin
cd621194ae7a8131c0b0731650c09446c2db149b29443dd672b5a4eff4f2510f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 5392 bytes
font_01_sfnt_off00010591.bin
ff4be35fe6876f1c9fe0bed428b3426f38c8360b0595247557b1312f6e9250a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 10656 bytes

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