Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d82388303ebc9b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-20 00:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 350fd548e5cf4e989d72f1a91de5dfa2 SHA-1: b55622232bd671876130878709026c267e4f2a6b SHA-256: e2d82388303ebc9b3c159d1d2408e012ed7a72802cc6f533ed9092708c524315
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary one pointing to 'kuzutuzo.ru/strik'. Heuristics indicate this PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to a compromised site.

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://kuzutuzo.ru/strik?utm_term=armor+of+god+bible+study+for+youth PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fecbe62d30ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_6013dbc5cbfa9.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/Tgfiiqv/baby_shark_lyrics_copy_and_paste.pdfIn PDF document text
    • https://walamezer.weebly.com/uploads/1/3/0/7/130740591/7936325.pdfIn PDF document text
    • http://kukepagodapopa.iblogger.org/concierto_aranjuez_trumpet.pdfIn PDF document text
    • http://blablablacar.online/nisigunajajivisujadapupefe8nro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409826/normal_5ffd59ef5fc39.pdfIn PDF document text
    • http://gokojemisivuf.22web.org/48043751542.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/hahiheF/viviterogelaruremel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366625/normal_5fcdc28d935b1.pdfIn PDF document text
    • http://itdiscount.info/nipoluwimarodixivuzezojetm482m.pdfIn PDF document text
    • https://pegelukiratek.weebly.com/uploads/1/3/4/5/134503056/53163e18f.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/2c7c9944-40e1-4f75-a229-4ed7f936b95b/duo_therm_rv_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b054be-69b2-43e5-b432-3d7fb642250e/balawatexuzit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a061e1e-b518-4f1b-8d7c-0c8fdfc0806f/29896353174.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 5344 bytes
SHA-256: 11e3c2193fd6b2b18feb9068e2bec7b3db8ce7d941a3072c60ca898af1e74b33
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 10452 bytes
SHA-256: fcda5a014fb71b5e4289efa4cf28c30d7f932faa3881dd76aecb379622b33562

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