Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f1456f7a78b59…

MALICIOUS

PDF

61.9 KB Created: 2020-11-23 17:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e64cc26f51b092230dd7bbba131b1c65 SHA-1: e18a0488eb3873c3fdbefa872007a4c89e743055 SHA-256: bf8f1456f7a78b59ec89d339d9e75b1ba65b46bb9f804edee25500110124df94
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://trafffe.ru/123?utm_term=circuit+worksheet+4th+grade', suggests a phishing or scam attempt. While no scripts were directly extracted, the presence of embedded links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=circuit+worksheet+4th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421215/normal_5f9ac9e4031aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f897e00b3833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f9cf1e6d678b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5f9e45dc3540e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_5fb41b12691af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f9a89071a16f.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/37e80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5f904d85bc734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_5fafded1dff54.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/nupapadolufamimivif.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/tobobowu/9226205149.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/netbeans_8._2_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/male_names_for_flowers.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_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 5316 bytes
SHA-256: 1113bf58ae46a4522cb92097f60460efd1b97ce8ffe4323fe4fa7fbb1a065b72
font_01_sfnt_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 9828 bytes
SHA-256: 3c4a7ab36a3d67baa1fc640dab7640cd65c7e87c8f381dffea1dbda459018b3b

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