Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d660668ebd36345…

MALICIOUS

PDF

78.6 KB Created: 2021-02-18 21:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f6a5e593306c315593490274df4d538b SHA-1: d2fb2d8cd2b9d1684658eaccbd68c395d9775307 SHA-256: 8d660668ebd36345a6bb4dc69ede0e995e9d78b69c4c6328f2225f3c79936991
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for phishing and SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The embedded URLs are designed to redirect users to potentially harmful websites.

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://druttle.ru/strik?utm_term=ruger+p95+rubber+grips PDF link annotation
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/dcde198881739.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/5b581d5d8dbc9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_6014ff34b1d7f.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/iiZjgjj/free_mini_golf_scorecard.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/ghMjenU/xosisutezepizuni.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/Rzugfjj/light_up_jumpers_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/gjcXPhf/53546885212.pdfIn PDF document text
    • https://vaputonusodi.weebly.com/uploads/1/3/4/4/134493057/9517063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5fe40ad690d34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rimepusox/buzarada.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/namexotinexilowolaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/definite_articles_in_french_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/cinebench_r15_full.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/html_css_javascript_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/achievements_presentation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/format_android_xml_online.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/b._sc_1_year_chemistry_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/calgary_weather_snow_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/lodux.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/bopup.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_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 5172 bytes
SHA-256: 5d7f4c87e7f80ffb5235541330ba867d57ad082eefdda29972d8db5785bebb5b
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 11656 bytes
SHA-256: b80985706a5757a9fcc5d1df7507564ba9fac8a814b958278e0b3f5c17fd5604

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