Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef8c02746e5cb91…

MALICIOUS

PDF

83.9 KB Created: 2021-06-09 03:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 427f07ecc9fb9c0ff53d45466271f064 SHA-1: 8efc107966d1d6b091430c640ed789372ed058b0 SHA-256: 7ef8c02746e5cb910094f830c77b4bb47643ff1872771ceb0a17e413fb626438
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a link farm, suggesting a phishing or malicious download attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'mp3 download' and the authoring application 'wkhtmltopdf', aligning with a lure for potentially unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/pbw?utm_term=bailando+mp3+download+320kbps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471723/normal_6028c3503ac2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_602d47bfbfe3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_60589923869d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384154/normal_5fe17eef7a9ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_606a89832f857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_603d04a2b244a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_604b5308414e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fca26bdef600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_602b0cb4275bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6289a466-a1f5-4c92-997e-afa044e4c6e2/kegirabijonakevadok.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/w/file/fetch/144569592/14721914339.pdfIn PDF document text
    • http://josinibugaju.pbworks.com/w/file/fetch/144694278/libro_de_espaol_lecturas_de_segundo_grado_de_primaria_2019.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/what_is_eternal_sunshine_of_the_spotless_mind.pdfIn PDF document text
    • http://pitavumiza.pbworks.com/f/aprender_coreano_grtis.pdfIn PDF document text
    • http://lonazak.pbworks.com/f/nespresso_dolce_gusto_manual.pdfIn PDF document text
    • http://nadisizaze.pbworks.com/w/file/fetch/144703686/8963799220.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144868341/how_to_write_a_incident_report_statement.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144500133/what_is_form_in_design_elements.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/w/file/fetch/144902466/zilexoramupawikuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/197b814d-2b01-4c79-b2aa-c88abce185b7/mazawolatigavulijis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 5792 bytes
SHA-256: c86e991bf1d50d20dd8a8d79602f30283cc145d8661497a0247718885092883c
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 4496 bytes
SHA-256: 5c4bcd3f6143185761e721f9cf22915d42fae50ba0104cd292bb9c454ff531f6
font_02_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 12076 bytes
SHA-256: 17ede9f522796d9a3c4411325fb000b628b1b4a009163ac5650c9373b9ea4082
font_03_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 16352 bytes
SHA-256: 9cb0650af5bdb2e8593988a361a40fe1030b61ea25d8fce7fab67310e0b1f9a7