Malicious PDF — malware analysis report

Static analysis result for SHA-256 e533d2b53151e12b…

MALICIOUS

PDF

68.4 KB Created: 2021-05-29 02:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c897b095fef2ac944fe2cc91cae0b61a SHA-1: 53d2095211c18347dc8a76ba9ed6f9b414cba412 SHA-256: e533d2b53151e12bed2c5c512f894d651cf58da951413d667d3c0d1e24ec1db2
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-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://resalured.ru/strik?utm_term=conceptos+de+biolog%25C3%25ADa+humana+pdf PDF link annotation
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/kasapebegeme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_5fe36b4345642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_606deffa2dd3e.pdfIn PDF document text
    • https://kaxamixerev.weebly.com/uploads/1/3/2/7/132712358/9305569.pdfIn PDF document text
    • https://tobiwetizipuwon.weebly.com/uploads/1/3/5/3/135341648/febipezu.pdfIn PDF document text
    • https://ximuwiwafit.weebly.com/uploads/1/3/4/8/134851464/4113295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377114/normal_5febfa97da63a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415748/normal_5feee3bca5a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475563/normal_60471fe8907be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373776/normal_6003e62b73243.pdfIn PDF document text
    • https://legobunisazej.weebly.com/uploads/1/3/4/5/134501617/5742590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_6035d6217bb53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390057/normal_5fe15cefc7b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_6061efc963236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_606c7b01eb987.pdfIn PDF document text
    • https://gaxowaxogofesix.weebly.com/uploads/1/3/4/7/134719425/3500429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 5572 bytes
SHA-256: 396312091ec41b2b6fc4173dae498e34c4842e620256496090e6f6681d168286
font_01_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 12076 bytes
SHA-256: 4e9167c1021ad94ee7a2281f602feb14cf685ac267f4751db43d3f7a36809cbc

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