Malicious PDF — malware analysis report

Static analysis result for SHA-256 e136d7e9b87c8b74…

MALICIOUS

PDF

95.6 KB Created: 2021-02-26 20:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4e2fd1f69f662581aa4866aeed50ed56 SHA-1: 62825ceb67a41a8d7a63f3a6f354ad819f48e583 SHA-256: e136d7e9b87c8b746becd3d5f77321bdf7ec50df1627b20382e0ef8d6fbac65b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/wix?keyword=managerial+economics+and+business+strategy+8th+edition+chapter+4+answers PDF link annotation
    • http://sandwichhq.club/polaris_280_parts_diagramtj34m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_6013e9466a2d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_6012c27171ea2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5ff49b059bbb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_600bef137dce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_601630f736787.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/aprendizajes_clave_biologia_primer_grado_secundaria.pdfIn PDF document text
    • http://indital.fun/vesizonqsksk.pdfIn PDF document text
    • http://world-wildshop.com/87579374406jn1qu.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/how_to_find_the_choke_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_6029355957882.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/how_to_use_hamilton_beach_digital_steamer.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
    • http://kavonuloruzofeb.rf.gd/sezuwixusuduvebiwulo.pdfIn PDF document text
    • http://magonusu.epizy.com/aggiornamento_android_q_honor.pdfIn PDF document text
    • http://ziwivalotezeti.rf.gd/76008635441.pdfIn PDF document text
    • http://kowelakava.rf.gd/id_card_vertical_template_psd.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_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 5992 bytes
SHA-256: eb8206388e55e760b6f2f5aaa31645b811d2c3a41cd9bc9b25bee834a4ce612e
font_01_sfnt_off00013d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 10780 bytes
SHA-256: c84154f94f54199d7817ca643c6c1d8acf0d7fe953b2b7d78ff5efd0184a7c77
font_02_sfnt_off00016216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16216 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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