Malicious PDF — malware analysis report

Static analysis result for SHA-256 5118c36989e07ba3…

MALICIOUS

PDF

76.7 KB Created: 2021-04-20 10:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 39b3d44485a4eaafe202dafa0ca8e4a2 SHA-1: 853d78102993dccba9509164724fd38133b41c9f SHA-256: 5118c36989e07ba39217896b2c5d68dcbadda548e281cef4c98f03329d499380
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-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://dugedepap.ru/strik?utm_term=how+to+complete+summary+in+ielts+reading PDF link annotation
    • https://tuwowezofe.weebly.com/uploads/1/3/0/7/130775341/9510975.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fe3897078fd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5ff8bc0d83390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480408/normal_605a0e97cb04e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_6022eacfc8035.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/8449754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_60602fd55386e.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/pegozegi/author_s_purpose_persuade_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7064fc5-385f-4756-822f-8bfcfe134cae/kumir.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/disikirubug.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/81083451134.pdfIn PDF document text
    • http://mopezit.epizy.com/78970822387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88004b3-a927-40eb-8e19-64a94b2efe39/xutilezikusojafi.pdfIn PDF document text
    • http://lupinofukebov.epizy.com/turtle_beach_elite_800_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/27693423291.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/how_fast_does_a_lamborghini_gallardo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc11790-2024-49fc-ba41-b3475e3fcda9/lixanolewakavoxebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8144fe82-4e1f-40a1-aa2d-4fc86d3bb724/redotifovokorog.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 5548 bytes
SHA-256: f3358574d1c0995270acb9c810aaf506959507aad2ab790ec7d73c26d09cf85d
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 11208 bytes
SHA-256: e8e53707b9b49bb7a655dbbed83359a7f3c98f0ab676d9d797ee35934eacde54

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