Malicious PDF — malware analysis report

Static analysis result for SHA-256 eece8f0daf7206b7…

MALICIOUS

PDF

70.5 KB Created: 2021-01-05 05:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: eba15d035d9cd171724c2d1da5b6fee6 SHA-1: eb0a5cd9a3f5d044cd016fb53e7a1131487995e7 SHA-256: eece8f0daf7206b7f91f843cac23ee565133edaacdf1a5ccf0d727d1dd588763
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to redirector infrastructure or link farms, such as https://ggtraff.ru/aws?utm_term=cakewalk+sonar+free++windows+10. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host numerous external links, likely to distribute malware or conduct phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=cakewalk+sonar+free++windows+10 In PDF document text
    • https://cdn.sqhk.co/ludozenidi/iggcZ6H/xbox_one_series_s_cyber_monday.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_5fdbc4623a951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fef7cb68a441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f92ab9d5d3aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_5f9d9b197919f.pdfIn PDF document text
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/8a94c5425aa12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f8f5a5be7d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f8809cf35a69.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/4bfe19b9-a634-45f6-97f0-adc087d5d27c/xozeruvipavapupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242dbe7f-72ea-4659-9b83-5992df6c643b/zixamiralijalazilesuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98f735f-21a0-48a5-a63b-768f211d3b28/fulusifinunanovixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227d644f-d41c-4fe2-bc59-3d997098d8df/eye_fi_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce1de3d-ddac-4536-ba86-68a765675122/core_connections_algebra_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057d2a50-b6d3-410c-a963-00095eecb827/66670926617.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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 5156 bytes
SHA-256: 8201da47a0ef62d767ff113a3dce2bb4a4d55089971e6827f1bd3ebf541c3e7f
font_01_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 10656 bytes
SHA-256: 2c34baaff157e0f91073e03e8d0ac0e35d570bd8981fae3d542a04c0ef8eaea0

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