Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdaff3b2cd39ba5…

MALICIOUS

PDF

86.2 KB Created: 2020-12-17 12:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e7d7ff9a8171fa117d7f8a0cda895786 SHA-1: 1ffa9ad63577434da4d7467efe51ffd65bf52f2d SHA-256: 4cdaff3b2cd39ba508de3de21d9e7f67343b2923d1828c0216fc20596301bd0b
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=advanced+dungeons+and+dragons+player%2527s+handbook+1978 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470835/normal_5fb69cb6cd8fc.pdfIn PDF document text
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/9522675.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/5fc6497fc14dfd36fe162dc2/t/5fd6dcf9491a58544a23c1ad/1607916793429/grizzly_g1023_table_saw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/29732772800.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f2f6c89e1c4b8fbea157/t/5fcd6e4e9aa2de0c64a7de38/1607298638947/pull_him_out_level_197.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d6ee6d49a06bb883dd6/1606372720714/26016183589.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11abd2bbd74065807b22d/t/5fc2a2f3cb3e0f5771a636d2/1606591220128/module_9_study_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ca83f9866f3fd2f56add/t/5fd1016d2e4f94534c7bb146/1607532910380/hill_climb_racing_car_game_play_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd308239b0722912b0841/t/5fc1462bbc819f1cf4070114/1606501933296/92296002190.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce2f7b08bb286b7fcda3d5/t/5fd6eef972b1137fa98a7d39/1607921410326/balancing_equations_about_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/pubg_mobile_sanhok_map_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b7b7bf71053ccb0f47f0/t/5fd0c54b12264b5dfdd40208/1607517520646/vanilepanijotupivudesofu.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_off0001106f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 6208 bytes
SHA-256: e6d2c7c8bd4dee8923497d87c4c618b2d240e46d1e76764461fb63eea482b02b
font_01_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 11112 bytes
SHA-256: e50aba5ece6a9a3508b236e5d98d699be30c1af57303c78180ebe2161267f8ea

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