Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fb5cd52ed6f7fd…

MALICIOUS

PDF

70.7 KB Created: 2020-12-21 10:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f8d82b98acc210fe8a0112c8770d4e4b SHA-1: 70178a1a2da614e5b8e53180a84270e3a43f95fc SHA-256: e4fb5cd52ed6f7fde3fe9e3f3f1404af814cbc5439cd574ee8e7f1eac1a0419e
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic firings indicate it is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The presence of a "Goodreads app icon" in the document body is a common lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/strik?utm_term=goodreads+app+icon In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_5fc0c2ba06c75.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/74dac8a506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f99a77a96a4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530712/normal_5fbc89cf341a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5fcd3a33a045c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5fa88fadebcf7.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/zudaleribezulis_ribaxu_zudovozixezuviw_wegavuwuma.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/vepulakanug.pdfIn PDF document text
    • https://mipixapotorifa.weebly.com/uploads/1/3/0/9/130969355/4520704.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/xojitowumi_zonegamokuwuxi_bolojuxinuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf9182c6de34c7a3887a1/1606220057707/royal_purple_transmission_fluid_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a3db5a-2d80-49a4-97d3-33e2b8b7fa5d/i_ready_central_learning_games.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc81a80526ad1a5999a26b/t/5fdd0397e35148683a8d2bc7/1608319896007/king_size_cotton_bed_sheet_sets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde97c9d0ff57695e6cefc3/t/5fdee8cf42c0045a330662fc/1608444111935/bottom_bracket_cable_guide_carbon_frame.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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 5068 bytes
SHA-256: bcb9a5bc7fcabfc281d6a08b7d56a4959c8473b301335b3929e056f4467e197a
font_01_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 10744 bytes
SHA-256: f60617f14927d2393339006a581f375e630154c2bf95adc3a290db75ef2c0129

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