Malicious PDF — malware analysis report

Static analysis result for SHA-256 593d44f250fa935b…

MALICIOUS

PDF

71.8 KB Created: 2020-11-17 09:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0db1d5362dac9e540578e567bfce07e2 SHA-1: d281432256e6db748451ad16bedadd1a104f54dd SHA-256: 593d44f250fa935b79e1956d42f54ae9939a56a2e30693de09e4e5582a96998f
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://traffking.ru/strik?utm_term=signals+systems+and+transforms+5th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f952415a79b8.pdfIn PDF document text
    • https://besogedawifajop.weebly.com/uploads/1/3/4/2/134234635/dedogumuw_vubuliwex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f870a1e96733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5f9dfd2f02ecb.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/xeseja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f8bf8056271b.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5f8c7fd71c222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f90bd27e1c6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5fa3451068d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5fa0a78acaad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_5fb34b9b69991.pdfIn PDF document text
    • https://zakewurez.weebly.com/uploads/1/3/4/4/134471700/dofemebabagigixewola.pdfIn PDF document text
    • https://zifevenexi.weebly.com/uploads/1/3/4/5/134528386/2537917.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/02802fa4-b8ab-4c0b-af79-363e7eeb14a7/junasopexuwukivosix.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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 5784 bytes
SHA-256: 8e3c13c5ff5ed66e4da0970e8895d8477f13b4c3517ae048e8d01a36e485f347
font_01_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 13120 bytes
SHA-256: 2cc9dd878926bf3728c8ebb8f484b8e39c22848518ba90c793567d80964072e9

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