Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d876128d0e94091…

MALICIOUS

PDF

72.2 KB Created: 2020-12-14 18:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 84b091d9faad1ebd48e0250359cc3267 SHA-1: d7800ff48ec06fa1ad552b05d6af61381c0a7dd4 SHA-256: 8d876128d0e94091b2987821da6345c77a8feccb5a13e0a4f7979d51aee557df
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://ggtraff.ru/strik?utm_term=calima+planet+of+the+apes In PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/pifanodajoxukafa.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/41aab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5fa06460099ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f9a2b401cfc2.pdfIn PDF document text
    • https://varemajog.weebly.com/uploads/1/3/4/5/134585454/f696c944562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_5faeda7db0a13.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/aea430f0876f.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/923ec2.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://static1.squarespace.com/static/5fc5b7ce60f2895dc108d09c/t/5fcf144c57846c5b834e6b58/1607406674180/guess_men_s_t_shirts.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57dbce5c7695ca9ba8aee/t/5fc70fa593ad1a481212dcc4/1606881191315/mermaid_wallpaper_hd_for_mobile.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1079560f2895dc1e88f35/t/5fc97c7f9bc93d20d9a32470/1607040127524/mifedojisukufubega.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf533a08845d0924813546/1606374205127/68072157415.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53df03398ff75154a5964/t/5fc8782de101942bf771f161/1606973485833/bonipurefipedukapelivotef.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcecc3225f96d1b32d21edb/t/5fd5ffd45b1f6f7539ccb416/1607860185497/project_report_on_animal_cell_culture.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_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 4856 bytes
SHA-256: d06c27b3223806e7317fdd661517a8edba5cd8201b27ac6141252f82f8ab993e
font_01_sfnt_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 11968 bytes
SHA-256: 1fd9bc4899a4e413d188349787a741f4d2eee6d8662d196e63ac1ecba610fd91
font_02_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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