Malicious PDF — malware analysis report

Static analysis result for SHA-256 50feed4206eb1a40…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 16:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74726da39b282901d3d0e50a329aaa1d SHA-1: bd72cf040eea0d50e6692ec29b6628f51c2472bc SHA-256: 50feed4206eb1a4072e5482c562b42489e63f4073f651e4f8099fecc47049fd8
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://leonvi.ru/award?keyword=catasterismi+eratostene+pdf', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external URLs strongly suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=catasterismi+eratostene+pdf
    • http://tevubirufizibun.iblogger.org/semomonefuwegagijawiraka.pdf
    • https://static.s123-cdn-static.com/uploads/4403940/normal_5fc85488883b7.pdf
    • https://cdn.sqhk.co/vujenibolo/hjrJaha/jugig.pdf
    • https://static.s123-cdn-static.com/uploads/4472488/normal_5fce798ae0995.pdf
    • https://cdn.sqhk.co/pesuxitum/tsk9cib/persian_calendar_1399_download.pdf
    • https://cdn-cms.f-static.net/uploads/4463794/normal_602edeea79213.pdf
    • http://bifovogixugot.22web.org/tovenaw.pdf
    • https://cdn.sqhk.co/xonepogafix/jj0ii3h/make_money_cash_rewards_gift_cards_ios.pdf
    • https://cdn-cms.f-static.net/uploads/4365583/normal_604d284cb9655.pdf
    • https://cdn.sqhk.co/xegogeji/4ianjzi/knife_block_set_sale.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_60597669331d8.pdf
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5fd8aeb384f77.pdf
    • https://static.s123-cdn-static.com/uploads/4393515/normal_60012d22b67d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3cbb5be2-43eb-41a7-aa24-285f27f58e8b/zawurilosazamipesenogur.pdf
    • https://uploads.strikinglycdn.com/files/844d2f59-42b1-446e-a78f-9070f0e507c7/drawing_reference_portraits_and_poses.pdf
    • https://s3.amazonaws.com/tevigotu/18436668137.pdf
    • https://s3.amazonaws.com/bulozor/lufemegubukadajufevo.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_off0000e779.bin
2a4e06e0227fa467dcf1423dcb8a752b2c87381f81ad70f577f445e3a1d14473
pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 5060 bytes
font_01_sfnt_off0000f892.bin
3ad8cd31d0fc274f446a839dbe2cc68ae8b0df6b69953a8090a1e467f029afb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 10964 bytes