Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee18888661c19697…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 05:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3291523bece65af44f0a1b85dda19304 SHA-1: 706ed6ea4487e02051c4c8e8ad05ac4d2c883aa9 SHA-256: ee18888661c19697fa489a0efe2769d7354c39a96140d4cdc6cd2effecdb9f49
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to boost search engine rankings, with numerous external links pointing to other PDF documents. The PDF_SEO_LINK_FARM heuristic indicates a high volume of such links, suggesting an attempt to drive traffic to potentially malicious or spammy content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file, likely related to phishing or malware distribution via the linked external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=faringoamigdalitis+bacteriana+ni%25C3%25B1os+pdf
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/4961169.pdf
    • https://cdn.sqhk.co/sevijeruba/eHgdhcT/31436160620.pdf
    • https://getawotenag.weebly.com/uploads/1/3/4/4/134443600/c253812fdb.pdf
    • https://cdn.sqhk.co/mewuwemiromi/b2wjegj/championship_manager_for_ipad_free.pdf
    • https://fanolukexepafo.weebly.com/uploads/1/3/0/9/130969893/kurotulekoti-tumutir-gikegufabubusa-vivimonabexojom.pdf
    • https://cdn.sqhk.co/niturunajik/rjhegiv/nokudi.pdf
    • http://dorightpress.com/helios_airways_flight_522_reportxrie9.pdf
    • http://zahlungsservice-ch.site/bautagebuch_beispieludu7q.pdf
    • https://jumozapanase.weebly.com/uploads/1/3/6/0/136001057/firupif-mixeximo-kureka-pemituxokuxuwu.pdf
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/9584996.pdf
    • https://cdn.sqhk.co/baluwofuk/hjjbgjT/rocketbook_smart_reusable_notebook_review.pdf
    • https://cdn.sqhk.co/fejisedetu/a1hcvha/alima_s_baby_2_virtual_pet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2092cdb6-f4a7-4b7d-a005-a18ae452746e/vimutonuluzif.pdf
    • https://uploads.strikinglycdn.com/files/6a63f1ed-8af8-4c1d-b60d-439aaa26fc02/que_es_valor_final_en_matematica_financiera.pdf
    • http://botusijafen.rf.gd/63331402761.pdf
    • http://nazifaba.rf.gd/vuluzufibamipevape.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12a.bin
e6da94f1ae7d88e50136e281f6a1d136c0e85a3b7c1379fe58ada74959180722		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 5572 bytes
font_01_sfnt_off0000f3bc.bin
5e45b3e5ce7af9c9e4adcb7d3bc35de052c7c432d8a900c3c0467f6c4cc26083		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 12056 bytes
font_02_sfnt_off000119a6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 4324 bytes

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