Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ffeb8c51214609…

MALICIOUS

PDF

70.3 KB Created: 2020-12-22 23:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7b325760b6b3aee57240b77086e071a0 SHA-1: 215aee13fca590312f1f55fb40b71a7e7e8cbc7a SHA-256: d5ffeb8c51214609703df72675989174d0f6e86cf8251f9fae401ae294f284d3
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 external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages. The document's content, though obfuscated, appears to be a lure related to 'Greek and roman theatre pdf'.

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://trafficel.ru/123?utm_term=greek+and+roman+theatre+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484370/normal_5fc245bc16a85.pdfIn PDF document text
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/bc6e4abba265a.pdfIn PDF document text
    • https://dajedenutiwifux.weebly.com/uploads/1/3/4/3/134318988/lebobix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f959818dab45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444646/normal_5faf301c09f1a.pdfIn PDF document text
    • https://netiwolofud.weebly.com/uploads/1/3/1/4/131438008/welaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_5fcf0d3069fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fc1aa61657b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_5f8bbdf3a4291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5fa650a6aae64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fc1aa78c72ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5fa9d37fd3dbc.pdfIn PDF document text
    • https://xufiporugagom.weebly.com/uploads/1/3/4/7/134705457/ximizo.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://uploads.strikinglycdn.com/files/eb34c5c5-6746-43f0-b829-086ee0fd69e2/a_thousand_splendid_suns_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d952d1-af90-49a7-b89b-55cd4a37a940/76952247461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d178745f-6ca2-4032-873b-20a4b7c30711/wrinkler_cookie_clicker_strategy.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_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 4904 bytes
SHA-256: a6872fb6532a2005cf4613effd3adc62fee6ead3950f8304a0091edb3e219854
font_01_sfnt_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 10312 bytes
SHA-256: 651dafdc7a733ec452e797a1a5ce4b40da0c98009343bc9d355b6f55de1b0c6f
font_02_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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