Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccc53b66d817e23…

MALICIOUS

PDF

67.7 KB Created: 2021-03-17 14:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41e1c65e2413c1b10ab8c34848da9283 SHA-1: 95fafb98dfe0cdb6368677338608de74522acab8 SHA-256: 6ccc53b66d817e23dfd8f2f3192692c937f58db0c6b728ca649eaca9bd681499
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=the+kid+who+ran+for+president+read+aloud PDF link annotation
    • https://dovomarolod.weebly.com/uploads/1/3/0/9/130969455/b9fa2d0ca4aec9d.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/wijofido.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449603/normal_5fe36b8fef309.pdfIn PDF document text
    • https://kagapefox.weebly.com/uploads/1/3/4/8/134846757/3776415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_6008d4e7b19e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480579/normal_5fe27676a085d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_602e688fdf932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5ff34752bd83b.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/8061305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_600817fc51bda.pdfIn PDF document text
    • https://warigiwedekepap.weebly.com/uploads/1/3/4/6/134655399/135749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376609/normal_6019d5a78aa88.pdfIn PDF document text
    • https://mefirotevi.weebly.com/uploads/1/3/5/3/135314773/2036753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499005/normal_600b1d3b539a7.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/ragejufa/biotech_executive_summary_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/33790545065.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/nutepafurukab.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/comparative_adjectives_exercises_with_answers.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_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 5236 bytes
SHA-256: 16d0222693e89aa1797b790e91e93d6a0f31e71b579cc75b5c4c331de97af481
font_01_sfnt_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 10344 bytes
SHA-256: 10d47b3de705c7200b3bd501d50ecabc2fb14e951076c9231dfef727281e8d8a

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