Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05a16d3958a5e90…

MALICIOUS

PDF

92.7 KB Created: 2020-11-30 11:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff1563d5075e4a296061ca0e39d81d51 SHA-1: 59d2bcb034fb47d485fd8f7db4a80a7b90e3389e SHA-256: e05a16d3958a5e90b2bc3ec9fa98257ac916b58de9d6ac246f46bff7580295d2
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update. The embedded URL `https://traffine.ru/strik?utm_term=2020+census+jobs+nassau+county+ny` is likely part of this lure, potentially leading to malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffine.ru/strik?utm_term=2020+census+jobs+nassau+county+ny
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f9b83c3dd341.pdf
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5fb2ca1f91b23.pdf
    • https://cdn-cms.f-static.net/uploads/4446038/normal_5fc326a5c0d0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/savifin/motion_graphs_and_kinematics_worksheet_key.pdf
    • https://static1.squarespace.com/static/5fc0e526c6229360ecacefcf/t/5fc27c81173fb5383bf3629f/1606581380642/nanonos.pdf
    • https://s3.amazonaws.com/lodunixodetum/hotstar_malayalam_movies_free.pdf
    • https://static1.squarespace.com/static/5fc112c117e7202640eb3140/t/5fc16c943c02f22b9d42c3c2/1606511765371/tefig.pdf
    • https://s3.amazonaws.com/vuraradaso/close_up_pixel_cartoon_character_answers.pdf
    • https://s3.amazonaws.com/robumuduluwise/jijediwomozuxomozakaketov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cb3.bin
c19144b94dcbe54bec2d32258bc9cb6d9b36c1c23456ca8d6e3b47899eb69d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB3 5160 bytes
font_01_sfnt_off00013e55.bin
c056ab37a20fdec06ac4516ab4bd6b37bc52627d8f708dc24a239674c7100489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E55 11816 bytes

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