Malicious PDF — malware analysis report

Static analysis result for SHA-256 951aebb64089a724…

MALICIOUS

PDF

72.5 KB Created: 2021-03-05 00:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1526f61f2d11e74cba81297cca1e00e4 SHA-1: 21f35b8bc39033fd2222fc820c018b385bfe2347 SHA-256: 951aebb64089a724dd3a5fcdab2206de7f68a964f86c1b3873df44b9f13b97d4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'https://seumenha.ru/strik?utm_term=best+web+hosting+service+in india', suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of many external links and the high ML score point towards a malicious document designed to redirect users to potentially harmful sites.

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
  • 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://seumenha.ru/strik?utm_term=best+web+hosting+service+in+india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412573/normal_603ed6269b9c6.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/iXhevhj/tor_browser_32_bit.pdfIn PDF document text
    • http://niscourse.com/bypass_icloud_activation_lock_2017_freejx2ih.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/gfcighb/93609837967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_601dbb0353b11.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/MZhbjch/simcity_buildit_pc_download_ita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409256/normal_5fdd6d6514ac0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427273/normal_5ff0187d442a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5fe049531d93e.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/9GsBicZ/kisutesefovoxajuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447646/normal_5fdcfb738f491.pdfIn PDF document text
    • http://haifaiv.ru/namigoparuzulotajiwozozup3dxgk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_603009e72f6cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witigegewujal.rf.gd/wesisofijegete.pdfIn PDF document text
    • http://tujefozumuresul.epizy.com/35513946871.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_07cc86383ac04e95b2f7df60a1691987.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_886a76d71e52493c8107a4f878f6b819.pdf?index=trueIn PDF document text
    • http://pusitarise.rf.gd/programmable_logic_controller_plc.pdfIn PDF document text
    • http://napepezubebefiw.epizy.com/aktu_basic_electrical_engineering_question_paper.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_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 5512 bytes
SHA-256: 6478b6df664f1abde8664b8999d26c3e98e47bd03568aa1d5d9fbd79a5867d0b
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 10664 bytes
SHA-256: 12cab438c86aa5f5f16be7033f875dd82e92d2ccf188625a7a31e58dc8faebdd

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