Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede0536ff35ae496…

MALICIOUS

PDF

70.5 KB Created: 2021-04-06 20:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c2af124fb4a229ed8a210429795e54fc SHA-1: 5b7701676dd420d3ed347e1581d47426b53414e2 SHA-256: ede0536ff35ae496024bcb32e22bdd9ffbb502c3225d58b59ff0345c51606015
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=cuneiform+bone+pronunciation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5ff30b9446cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_6036c7a1687b9.pdfIn PDF document text
    • http://gekigowegijuvo.22web.org/kufugoxune.pdfIn PDF document text
    • http://tebepif.22web.org/algorithm_design_and_analysis_udit_agarwal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_602c3183ac099.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/58767685069.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/40865737352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_60436ac760ca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd7abca5bc22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_602996f25a6dd.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/zifokaj.pdfIn PDF document text
    • http://mimivudarevi.scienceontheweb.net/tesiniwefobuvakeje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasefabomodewiv.epizy.com/bthusb._sys_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/44330823501.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/dipupinegenel.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_dd658981b9b545949d8a51dfae3fec0b.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_b6c369cd822046e0b6db963467c57831.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_d4444c0500864583b2b2f0a3f8846d89.pdf?index=trueIn 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_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 4996 bytes
SHA-256: 64f0f7cf23f5ab19ca567ed826c4243ba7f81346889be288372e3be822f72303
font_01_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 11244 bytes
SHA-256: 104476e2ab598d46a1e1f4b35ddf1c9a620f6aeecccb311a98d4ac6b68bcb80c

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