Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d87aa705516a68…

MALICIOUS

PDF

71.7 KB Created: 2021-02-24 06:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0bf726d470884ab35b6e02148efb8d5f SHA-1: 9a6b3f8e8b715b39cd0c29a10c103fcbe21d74ab SHA-256: e4d87aa705516a68f8bd2bad2c0c3a5fe107a61913d3d2fd8bbf589be618640d
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=how+successful+is+5+2+diet'. This indicates the document's primary purpose is to redirect users to a potentially harmful website. The ML classifier and ClamAV also flagged this file as malicious, supporting the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/123?utm_term=how+successful+is+5+2+diet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_5fd3788a9eab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5fe8248617edc.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/icGXhge/tanixo.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/RhghcI5/kibowovowelagufukubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_601af2416f944.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/eClgihh/lenogubejebopugi.pdfIn PDF document text
    • http://zanetapoxod.22web.org/access_control_list_lab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5fe447b2a538e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaritopewebo.rf.gd/24438240302.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/front_storm_door_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/picture_reading_worksheets_for_class_1.pdfIn PDF document text
    • http://tubasip.epizy.com/35518941579.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/84978479484.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/jofegonitumagetipulupi.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/periodic_table_of_elements_printable.pdfIn PDF document text
    • http://mizixizomafupez.epizy.com/68737160083.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/free_adobe_premiere_project_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/92270362261.pdfIn PDF document text
    • http://riboparewi.rf.gd/39553519104.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/elementary_statistics_chapter_10._2_answers.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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 5020 bytes
SHA-256: 1eec85c2e18a46f32a06cc900e28b99fbf4c03ce0bb9322bd05b4859d16e7dff
font_01_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 10940 bytes
SHA-256: 21e9d18a014e45d5f75c11eeb4b2847897593ac41ba8a873d4e141eb445d87b2

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