Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9db66a924ccdc18…

MALICIOUS

PDF

77.8 KB Created: 2021-04-08 07:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e22d3b079dca3af423d126c5b9586fe0 SHA-1: 50989d09a48194ecff9870ce75a27b0e7f791d28 SHA-256: b9db66a924ccdc18e59a9fbecd977c36e7f8aa91cf37eac9e1daa894f1ece32b
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://gimoguvi.ru/strik?utm_term=2010+honda+civic+owner%2527s+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401994/normal_6024be4cbb590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_5fdca2d3bd07e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_603e9dc1c5c09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407795/normal_5ffe80f1d53c5.pdfIn PDF document text
    • https://betisokoredig.weebly.com/uploads/1/3/4/5/134505727/642940.pdfIn PDF document text
    • http://pibakulisup.medianewsonline.com/calendario_septiembre_2020_para_imprimir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5ffd5999e6c98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_602a8c38b8136.pdfIn PDF document text
    • http://lemafesopeposuz.mywebcommunity.org/jekiwomib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422148/normal_5fdde92db2683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454277/normal_604d16cd1a86f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5fd81b84147ba.pdfIn PDF document text
    • https://jivarogogujuno.weebly.com/uploads/1/3/4/5/134513891/5254950.pdfIn PDF document text
    • https://fadunununi.weebly.com/uploads/1/3/4/7/134747036/xozavoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_5fe5a31e40ac9.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/33042710-bd65-4a51-affa-6320170a5905/star_trek_discovery_season_2_review_guardian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed7463d-d5fc-46c7-b81a-13203dff492f/45555610830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c82199-841a-4398-86f6-018a22e15870/presto_pressure_cooker_01755_manual.pdfIn PDF document text
    • http://ruzakema.onlinewebshop.net/nekazovumolos.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_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 5596 bytes
SHA-256: dc20acdaeb39628915fa3b1d0d6d602afeffc38cddb03984b69db7f375ff9dbb
font_01_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 10612 bytes
SHA-256: ade04c28e56d9e4f1db50a9532a044c96a0402591d51180c414aac6eaf68afbd

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