Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4b754330f6b5be…

MALICIOUS

PDF

80.4 KB Created: 2021-03-25 21:28:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2c1865d7b0074b2ec90557bf46cdea69 SHA-1: 05da6fe857608cb060aa551818c6a3a4e6817895 SHA-256: bc4b754330f6b5be70ce0323436a5292f329a391084b37790cba6819ba40af1e
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 domains, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious sites, likely via spearphishing.

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://jottigo.ru/award?keyword=ficha+tecnica+definicion+pdf PDF link annotation
    • http://yourcy.com/946878712648aq77.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/939429957846wmhs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_601f337b88ebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5fc7155fa3348.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/75342740518.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/bEIidOH/tap_tap_gun_apk_mod.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/how_to_replace_ear_pads_on_beats_studio_2.0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_604d298c1d4f1.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/f5jbrbT/58130754906.pdfIn PDF document text
    • http://somubuzesixuwun.getenjoyment.net/c._g._jung_collected_works.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/igbhfjj/rupazuviruzobuzuved.pdfIn PDF document text
    • http://olymptrade.buzz/rivujipps3sm.pdfIn PDF document text
    • http://judupebe.getenjoyment.net/cartographies_of_diaspora_contesting_identities.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_601887b7a9ba9.pdfIn PDF document text
    • http://parhelifrl.space/pod_2.0_manual_settingsjmais.pdfIn PDF document text
    • http://gepavozo.mygamesonline.org/32831339986.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/39648923376j7e8t.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://basapixukeg.rf.gd/wunafikezutugukovudo.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/54708687024.pdfIn PDF document text
    • http://lawiferow.myartsonline.com/pidomuzijeduzalezamekeva.pdfIn PDF document text
    • http://melamepapate.rf.gd/4866087139.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_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 4680 bytes
SHA-256: 30094112167555e16b2a61b5aca55865f4252b2773f0672f55ef526125b93ff7
font_01_sfnt_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 11408 bytes
SHA-256: 4607cc153f1660bef3f3a8402a74d6bca586b07922bd9012473295940f03aa2d
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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