Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54eee35748df3a2…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 11:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 882451483e954fbbdfda41448a15a3ee SHA-1: 54e6dbee058e3b981294a0c8cc58d77de696a0e8 SHA-256: a54eee35748df3a20a7ff63d7f086953fb34bc2e6e788869b715bab0e9e4bf4d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=new+sag+rules+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408330/normal_601223e1c039e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482191/normal_5fc6967a1dc94.pdfIn PDF document text
    • http://ritual-venki.online/64717170086o8iy7.pdfIn PDF document text
    • http://mowuvivof.22web.org/wojesu.pdfIn PDF document text
    • http://fly-drive.online/zudotusidinuvuqd7bg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493920/normal_5ffd6e5963728.pdfIn PDF document text
    • http://trellos.fun/methode_lafay_gratuit32nxx.pdfIn PDF document text
    • http://tryraisins.pro/vamujunukoi7wmx.pdfIn PDF document text
    • http://befigter.xyz/the_lottery_analysis_questionsozyh4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ffd377b49251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402722/normal_5ffb75a0cb3d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_b2bef1a67dac4109bf068bca0a7b450f.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_bacca96098a548b4a2965bffd81a7c60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c270a619-bd2c-4a5f-bbec-661e9d8cebce/86376197797.pdfIn PDF document text
    • http://sisigetevi.rf.gd/why_gas_dryer_not_getting_hot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920bd193-88de-4a47-800c-6d1c29c77c00/python_loops_examples.pdfIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_0d67f87e261f4dabb2206e434a245a8c.pdf?index=trueIn PDF document text
    • http://fazomexaboru.rf.gd/kivobuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7abcf3-762f-4d2e-a38a-bf0fe8a6e3ca/samsung_galaxy_s4_manual_user_guide.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_ceeb2bf961ce468b9f06ebf710d74f13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7c54ed-6a7b-4177-a347-02573e4bec97/bewokunuzigat.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_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 5188 bytes
SHA-256: 43ccbb1b74075b50a8fa9e282bcf3171d093b1546e4ac4e210630a80dce91577
font_01_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 11940 bytes
SHA-256: 8b1654532fe27c884dea7f361fb66a78f87a5dbad7a282003adfdd64f6b98325

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