Malicious PDF — malware analysis report

Static analysis result for SHA-256 715d5ddf60417e2f…

MALICIOUS

PDF

91.7 KB Created: 2020-11-16 18:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 574209e3c80bb5fd80945f118f4ceca1 SHA-1: 987e824fc1c3cd8a539a8c826f76162be19fc10a SHA-256: 715d5ddf60417e2f49dc85f5af7e77f9881bb34ab6e4f889aca021202e6c5089
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://traffnew.ru/123?utm_term=ielts+speaking+topics+with+answers+pdf+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451563/normal_5fb27bf9d049c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5f9235e6965f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_5f9a809f0df64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_5f8e5aaedd884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8e3089c81ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f8ca92c1e279.pdfIn PDF document text
    • https://nilitimuxuzadox.weebly.com/uploads/1/3/4/3/134320754/0a993c487.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/gogaxawi_julaguvod_wivax.pdfIn PDF document text
    • https://xuxavapivobe.weebly.com/uploads/1/3/4/5/134590147/f1af2.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/lemudi_vumizevoke_selotesakijedel.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/9e4168f5-8b60-4342-a80c-00814b9f28e1/tafogelapupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c38fba-5352-4448-bc1a-b7a6906a03e4/nimuvaxemutumudet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585bb442-99bf-465f-89e0-8a4820975ece/jivoxemizel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7f3ed3-ae4f-464b-ade6-430369b2186b/12988542558.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_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 5992 bytes
SHA-256: d340a69e3e4156829354aa597c9c52a1c23709df337942578520d802f91eed53
font_01_sfnt_off00013ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 10156 bytes
SHA-256: d7b5f9fb9dc53b947c236742207935432eb57932bb322abcb0524659d921d6c1

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