Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fc22c993eba799…

MALICIOUS

PDF

63.1 KB Created: 2020-12-07 15:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e58699f09dfda9c3887896068b5358cd SHA-1: b319c61f26115aeda1b6206e5a97be58e99791f6 SHA-256: d7fc22c993eba79941af35ccf242388ddb818efe0a48c47ae84a385dce3b3795
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the primary links points to a PDF hosted on weebly.com, which is part of a larger pattern of linked PDFs. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=chatal+band++dj+naa+songs PDF link annotation
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/6cb078.pdfIn PDF document text
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/dudowajepovovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_5f9591b9d7161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5fca86d76fcb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fcdd028d681d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445343/normal_5fccbeb07ac4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f891677bb382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_5fa56fa8c0b8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5f9e2a8139c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_5fa40f3e99c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5f98b31db9c45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f92a38016adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8c4af64d8b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f8fde6c66724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc568d824b06a7eb31dbf25/t/5fc70de03ac9c763f4ce95a1/1606880739530/44361708680.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_off0000bbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB4 5112 bytes
SHA-256: c9719398614d41be1f6f428fba5ee9e02e74cabec6534787fdc34263df61e9b5
font_01_sfnt_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 10140 bytes
SHA-256: d75ff13f5e1c11a002a379521045f48916e86c098044ae1147aa98dc645f3069

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