Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cd2a66b855cfdb…

MALICIOUS

PDF

76.2 KB Created: 2021-02-26 09:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7da3cff7d293e2f506e0fc9af898a8e6 SHA-1: bcf4fb74f322c834663cd57f62d9e1a2f7c0f9dd SHA-256: e9cd2a66b855cfdb5521575a6b25f81cc90381747bfb66c0246d79dce69e71b0
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or link-farming attack 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=html+css+javascript+books+for+beginners In PDF document text
    • https://cdn.sqhk.co/zejejofe/NIicajs/philippine_stock_exchange_game_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_5fd8cd2de3269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_602eaa581d045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469374/normal_5fddbf2b259b5.pdfIn PDF document text
    • https://cdn.sqhk.co/gedugari/bX1jhjf/segipalabi.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/7157902.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/aSLjhhf/hmrc_self_assessment_tax_return_calculator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_5fe7b1328d0af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405907/normal_600773fc5e68a.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/JDjgidC/rivenapegewewimup.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/jfnidnL/minecraft_earth_mobs.pdfIn PDF document text
    • https://sulovuve.weebly.com/uploads/1/3/5/9/135973568/falowazubi.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/chxrgd2/50799314208.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/hielsz7/jeganegirijuxekun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_6024adfcb5d85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/pejazinopokilokaj.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/baal_veer_episode_1103.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_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 5636 bytes
SHA-256: 77f551fe354de24e02af332f39bf4513006fbef19b0241d6ce7e523cbfbc3c49
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 11588 bytes
SHA-256: 611e35182ab9e1fd1254f0cf27fe19077b512cd9634a8a263e37e0e438d45be5

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