Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3a9924a76d4ef5…

MALICIOUS

PDF

78.2 KB Created: 2021-03-30 14:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f9837ee0c42ae94830b171785e971a9 SHA-1: b374f7d1c09b97b85bae6816c1e4f037fa3c9e88 SHA-256: 6e3a9924a76d4ef57acefd583eca0db0bbeaac725575be8b4d74d322574274fb
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=how+to+service+a+50+hp+mercury+outboard PDF link annotation
    • http://zakewabo.scienceontheweb.net/9962836408.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/jadefegitiwuweke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_6061d6a1e0fda.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://lastasked.com/mugojudoto7r5ot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490929/normal_6007b59383576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_606015796e18d.pdfIn PDF document text
    • http://im-marceting.site/bohr_rutherford_diagram_worksheet_with_answerszcex9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_6023c859e13d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475847/normal_5ff0373a6a823.pdfIn PDF document text
    • http://kubidojizuw.22web.org/basic_russian_language.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60282e31b57c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_601165d622b65.pdfIn PDF document text
    • http://meetdouche.xyz/application_format_for_university_degreep99ss.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/50389353982.pdfIn PDF document text
    • https://noxolawozin.weebly.com/uploads/1/3/1/4/131452883/mojasakala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/99804032633.pdfIn PDF document text
    • http://tosefiwaniw.rf.gd/81048782604.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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 5904 bytes
SHA-256: 3242585b4c29c80f6158f421a05e164f7bf01eb0612380f70c607927a67bce1b
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 11788 bytes
SHA-256: 83c51191284482c4c524d91a3a83c1d807099e7a05fd2bb6daf6c53abbb6446d

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