Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25b70f68c4730e6…

MALICIOUS

PDF

67.7 KB Created: 2020-12-16 23:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5a42e003864c767c28032bce26af9bd9 SHA-1: 0f6dacb8150551486ff4e902d2d5720737f4a4a8 SHA-256: e25b70f68c4730e69ccaba1837ce6b352850680123274408d7a46eec2087b6ab
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=amor+liquido+pdf+descargar+gratis In PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/640910.pdfIn PDF document text
    • https://sezemizom.weebly.com/uploads/1/3/4/6/134622585/3540061.pdfIn PDF document text
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/066dd6b2bf0328.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/duvijodetan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5dc0a0a2757459b04ecdf/t/5fd146661d1a2b7683021def/1607550567191/murusok.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/cartola_fc_apk_atualizado.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/darklight_memento_mori.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/nibamagipaxojapadag.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeec57acac6192a8558c6/1606282949988/1_nephi_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fa08b7-c2d7-478e-8e52-9bb41819ea90/femovewi.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/mystic_krewe_of_femme_fatale_ball.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/dobexuguwevaz.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/jipanexujiwojikavosetab.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 5588 bytes
SHA-256: c033531fb3a9d4dd0361179374517de442932fb3ac6cdc406331758e7cba9193
font_01_sfnt_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 11856 bytes
SHA-256: e27f5e6f46754b5e8fcd5e685d723a0ebe8a5d0440ea168f5506cbcd7104b2aa

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