Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41bdcb43eb1deba…

MALICIOUS

PDF

78.2 KB Created: 2021-02-25 01:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b73ababf49b1d1cd2e95efadd39ed32 SHA-1: fc04d947707fed58b59de12e1c2d6cfcac7eb642 SHA-256: b41bdcb43eb1debab584c8e7d02d730521e6c3d463ad01e77374118a2d4078dd
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the overall structure point towards a phishing or malicious redirection attack.

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 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.
  • 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://druttle.ru/123?utm_term=a+member+of+the+chartered+financial+analyst+institute+%2528cfa%2529+must PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409000/normal_5fcc2865d7f87.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/gM2jfid/invasion_definition_microbiology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_5fd805e774418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_6020003e64658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_5fda3038e8040.pdfIn PDF document text
    • https://wikifepum.weebly.com/uploads/1/3/3/9/133986434/784991.pdfIn PDF document text
    • https://cdn.sqhk.co/segexiji/xidjcQA/smartsheet_stock_price_target.pdfIn PDF document text
    • https://cdn.sqhk.co/vetumuba/baed0gd/38199830300.pdfIn PDF document text
    • https://jajixawu.weebly.com/uploads/1/3/5/9/135992574/tipaboxixa.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/OhgZhc3/57572979948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujigakevomo.epizy.com/chirodini_tumi_j_amar_bengali_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/bpsc_ae_mechanical_answer_key_made_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/87597275392.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/biotecnologia_vegetal_y_animal.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/arthur_schopenhauer_livros.pdfIn PDF document text
    • http://tawexega.epizy.com/puzufafagij.pdfIn PDF document text
    • http://rivowotow.epizy.com/90262579281.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_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 5644 bytes
SHA-256: 80f72147eecbf4bf223af023bca045af6ef4715abcdbbd59576bd94cfe446c87
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 10976 bytes
SHA-256: 3c7c078a6dcab61f5bb5e81f30b9dd81d1c6b3a4d4e619b3cc3beacd1bc77328

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