Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c6330af341acd4…

MALICIOUS

PDF

68.4 KB Created: 2020-11-24 08:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d967613ccd7b39ff7b2692db9a9a0381 SHA-1: d10d0ae9959c0a29594f1aaf8d5a117d58aaea1e SHA-256: 37c6330af341acd4d4d22ba8e8298a5b160d3c5b5c20aa32d4d6a720d1ba26cf
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-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/aws?utm_term=application+form+for+job+sample+doc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454673/normal_5fbb6b35336ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5faf0bec855b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_5f90e36890cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5f9ca20843941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5f91bb870805c.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/f32632ce8d2.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/dubisilameso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393020/normal_5fa1946f90b2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f90527315de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f98c12204d15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fb9e2ec6b9d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f94dbf81d4e3.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/48d63b7e-f2f1-4fb4-b630-44fb10ab2f5a/eberron_cyre_names.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_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 5504 bytes
SHA-256: c9778d9443f96455c6dd2a0a036dfba78285bf3a8c9b19b401ec0a655cc2ee21
font_01_sfnt_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 10244 bytes
SHA-256: 3db1fdaaf287316f1265d5b0e8f5a5142436e4dcd041942c8391871c5373f09b

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