Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e0c9521dfc0c3b…

MALICIOUS

PDF

69.6 KB Created: 2020-11-13 15:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 55fc1f1a25414b769e788e98d2e9077f SHA-1: 2ac42e4706b86dac02f72b4d24f88c1fada56ea2 SHA-256: 87e0c9521dfc0c3bd94dce0cb97bb6a4c2d57f33f0b2114830640c8ff65e4514
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 0.9997

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://trafffi.ru/aws?utm_term=target+shabby+chic+bedding+sheets PDF link annotation
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/55e9d91103ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5fa66c31a6eb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f95d16e6d4fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8b2e90e1989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_5fa9335b57559.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/sadinojesok-gosoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f93798d6d87b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f90191a3585c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_5f928ab4d5387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fab7ea397d2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f88824718ef1.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/tekujel/69909525931.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_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 5360 bytes
SHA-256: 9e478805aa2332d396fcaf3cfa429dfac235b30327a5b4b920e1519b4563b61c
font_01_sfnt_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 11408 bytes
SHA-256: 4da25b98a2518279ff9fe6daefa77cacc217a221ceae12ae2cbfe4d44c79bc7e

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