Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb81be3f4f47a548…

MALICIOUS

PDF

80.4 KB Created: 2020-12-02 18:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a343ebac1d702b5803a9bb71403f2c6d SHA-1: 2eb968e31beba7913e4a2bb3547d10c3a82e310a SHA-256: eb81be3f4f47a54826acb06326149572ed415e95ba3e69193f30752cedc4f18a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics indicating it redirects to known malicious infrastructure. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern appears to be a link farm designed to lure users to malicious sites, likely for phishing or malware delivery.

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://cctraff.ru/aws?utm_term=free+grammar+coloring+sheets+middle+school In PDF document text
    • https://birisudim.weebly.com/uploads/1/3/4/4/134467091/150a5f023ea8e6b.pdfIn PDF document text
    • https://bobepeduzogir.weebly.com/uploads/1/3/4/6/134673546/voravivad_fevuriv_wuzefipi_rorefada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405638/normal_5fc45b94c3590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5faef32b5fb04.pdfIn PDF document text
    • https://rosikotukixaru.weebly.com/uploads/1/3/4/3/134312973/kejafidajusugu.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/xexaz_gokon_marekela.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/xomilofu.pdfIn PDF document text
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/vugikotozaxukef-tumimofe-tezamojapivew-gukekuxisabaw.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/forabolisipele.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
    • https://s3.amazonaws.com/niporofez/solawo.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/luwobemutepu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0bc473299f0c543bc65a/1606224836943/best_systems_engineering_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/actron_pocketscan_plus_cp9410_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/best_wap_sad_song.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3fb1173fb5383b6e2527/1606303666368/social_skills_training.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/vapozugej.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiwovowus/49847334544.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_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 5096 bytes
SHA-256: 16f0336187986f793602d63b20edf20c71d8a92e5c3646217670a7767805e63e
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 11000 bytes
SHA-256: e1df649d62097ccd82a2591381d9e0e1407140f12ea0ea4fb480a179f4b9785c
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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