Malicious PDF — malware analysis report

Static analysis result for SHA-256 4161f96c4e52f2ad…

MALICIOUS

PDF

67.9 KB Created: 2020-12-17 10:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1b5670f69f951e5fe4bc5ad6c3071ad7 SHA-1: 36d3dbe0bd2ff3a9dc44ccb7b5de1eb3d5d3e09a SHA-256: 4161f96c4e52f2ad8584db77e36170206902ef1a5348c60d9c27f4d17cb6c040
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing or link farm attack. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, likely intended to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the embedded URLs suggest an attempt to redirect users to potentially harmful sites.

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://traffking.ru/123?utm_term=beginner%2527s+guide+to+sculpting+characters+in+clay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386837/normal_5fb9894056f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_5faafdd55b954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5fda4a3fe8bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5fbf337d751e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5fd6630524dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5fbf035bcf42f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_5fb75c94a7de5.pdfIn PDF document text
    • https://difekubo.weebly.com/uploads/1/3/4/7/134714923/68d0adac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_5fbd6ce12ae0c.pdfIn PDF document text
    • https://vosorebozo.weebly.com/uploads/1/3/4/6/134698499/708964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_5fa967c733818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_5f9e1cf3bba6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wefadep/gary_and_mary_west_foundation.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/23486285433.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/tutudizuxijububobe.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/calendar_template_for_powerpoint_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC1 5404 bytes
SHA-256: 7c56ff1d669b1b0aca76b3c7cf78e2434e471b90e91f2e94d9d328f5a412b2d8
font_01_sfnt_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 10140 bytes
SHA-256: 079371ab417567495f98d4eb8ed96c86f4ad66f3098ca2c7fb55d6e0e7d90372
font_02_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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