Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b3624f4e69917a…

MALICIOUS

PDF

107.7 KB Created: 2021-05-02 14:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 10d89a38f96ce6c4dae5c32328d3fd60 SHA-1: 53571f40ace9149d9c564e02737ed93a96efc21e SHA-256: c0b3624f4e69917aa7212c5059891eedc0efce7b09e5146bf5311ae80003a36d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=william+blake+art+movement PDF link annotation
    • http://lnstagram-verificationbadgeform.com/another_synonym_for_guideliney5d78.pdfIn PDF document text
    • http://bitjoms.xyz/american_natural_history_museum_admission_feejphjz.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/66512142718.pdfIn PDF document text
    • http://fonixeguga.mywebcommunity.org/64073366571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6acf982-1d1b-41de-9678-3a19b79643cf/how_to_write_a_summary_for_university.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/anger_management_group_activities.pdfIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_9932076ee27e4fff8ed63226eeb7cb52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3adbf660-17c6-4ea7-87b9-b50e9430b1e5/speed_of_trust_executive_summary.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_cab96a29ac5a4f8e82fac20f003c432d.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_2eca7ab189874668934532f1a43f7ed9.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_d7089280261b43c1b5b184b9b5c19a86.pdf?index=trueIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_f7753efc65204787a62975c11cd30156.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_e38204e6ffe74ff99db64d6d903328cc.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_b62ccf8f094544d8bbff74d4b4398d8f.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_off00016cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC8 4928 bytes
SHA-256: 52564538c8de549e14f1a3494dc263ccdbfed123a382ab74f1e2591776044e8c
font_01_sfnt_off00017d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D89 10944 bytes
SHA-256: 8c29d489ef1b1f2edbf8e4c937cb4075418286ca272c2329e9ce2254db9e0fea

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