Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a24d3d03efd260…

MALICIOUS

PDF

69.5 KB Created: 2020-12-23 00:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f12700717031f254188dd955b19f4d91 SHA-1: e418c73649610eb9b8c1cc7ebac5ef89b733a7ce SHA-256: 87a24d3d03efd26041ca323e278adb9a43d42ce6421b9173772726e8469a20a4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious redirector, specifically linking to a known malicious URL. The ML classifier and ClamAV detection strongly support this assessment. The document body, though heavily obfuscated, suggests a lure related to a 'summer reading list template' to entice users to click the malicious link.

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://cctraff.ru/aws?utm_term=summer+reading+list+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5fae3e37cccbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f89daebb4fb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f93fa5e40557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f8ef1d402437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_5fd14d5cbdf41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5fc2d4db17f0a.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/nufidibodudulad/78413058366.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc30d185bcb0228a2907835/t/5fc96201cd60ed031212eb6f/1607033345630/asphalt_street_storm_racing_mod_apk_obb.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5481b084698658e7b4183/t/5fc8abf1ec83506b047fb4aa/1606986739375/eso_necromancer_pvp_healer.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde7a645fb7d01a9b07559e/t/5fdee0a0fb7de13a64649168/1608442024959/42299980555.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/58020448654.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4dd17acac6192ab72dd3/1606372818791/in_the_heat_of_the_night_tv_cast.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd539cc66bff209e8009b6/t/5fdd81122629b066aba1f205/1608352019216/zanuwidigipiti.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_off0000d0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F5 5384 bytes
SHA-256: 8112028538aa69df736175808e7fa00ea6c9fc10a6755cf24c6cd8bccdee022c
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 11120 bytes
SHA-256: 8a4317fa0830825e05f4f7c94a2d692e32be15b78c3f0dc89874113d29ae8238

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