Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4259a7f3505e09…

MALICIOUS

PDF

82.3 KB Created: 2021-05-21 14:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a50ea9f53663ca75762ddd361ffcfef1 SHA-1: 19273636db3906cfde0ba81d331f39fb40962227 SHA-256: cf4259a7f3505e09177282e4fda19d34ba1bd3f3f88c5cd04375e49c0ac8cda9
96 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for credential harvesting or malware distribution. The document body, though heavily obfuscated, references survey questions, suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=maslach+burnout+inventory+general+survey+questions
    • https://cdn-cms.f-static.net/uploads/4530036/normal_6038b445f0c75.pdf
    • https://cdn-cms.f-static.net/uploads/4415326/normal_6012e167a2654.pdf
    • https://cdn-cms.f-static.net/uploads/4448331/normal_60476428dabb7.pdf
    • https://cdn-cms.f-static.net/uploads/4486743/normal_600c6f7a13a36.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ae36bdb2-445d-4325-a332-a1bcf5b4c5a0/89451157373.pdf
    • https://s3.amazonaws.com/muvarelo/android_10_update_for_redmi_note_7.pdf
    • https://uploads.strikinglycdn.com/files/7d229076-75ef-475d-ac44-98ae9149085e/percy_and_annabeth_sleep_together_after_tartarus_fanfiction.pdf
    • https://uploads.strikinglycdn.com/files/cd264ec6-3cda-4b8e-a0bc-1ee0f13f225c/kuvamugavepepenuzugusal.pdf
    • https://uploads.strikinglycdn.com/files/e8be437b-803b-4328-8469-26a1cf643636/why_would_a_wireless_keyboard_stop_working.pdf
    • https://s3.amazonaws.com/lusegokaves/jufojoruze.pdf
    • https://s3.amazonaws.com/mejawiwomak/barratt_impulsiveness_scale-_11.pdf
    • https://s3.amazonaws.com/fosalizuzu/26438797956.pdf
    • https://uploads.strikinglycdn.com/files/bbc40ea3-ddd9-49cf-8a9b-bd76229d3682/how_to_use_microsoft_excel_2013.pdf
    • https://uploads.strikinglycdn.com/files/333951c6-2ac2-420e-a60c-7a74017087cc/59854764874.pdf
    • https://uploads.strikinglycdn.com/files/76973571-41bc-47c4-b4ab-6eab272b5a10/16292933450.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/fetojidixezosinepezu.pdf
    • https://uploads.strikinglycdn.com/files/7d173552-4e27-4867-92fa-55bdd080ed2c/tarot_spread_for_new_love_interest.pdf
    • https://s3.amazonaws.com/jinotugiwomo/julosoderesisolixasu.pdf
    • https://s3.amazonaws.com/zatasipezeg/technical_documentation_template_confluence.pdf
    • https://s3.amazonaws.com/nevowimo/51741336548.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_off000100c3.bin
f821b3d2b1308604c54c3d5faf55cd1b3ac8d62452de7fd7a6cac308877f500f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 5492 bytes
font_01_sfnt_off00011380.bin
f8a5897d460dc927b9020ba8338737853923c044b32311d185a3c2ca2ad351ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 11900 bytes

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