Malicious PDF — malware analysis report

Static analysis result for SHA-256 df839a7ad196fc38…

MALICIOUS

PDF

69.1 KB Created: 2021-01-10 08:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0e8b505fe01c5700079ed5c360374e8e SHA-1: 3117a9f10db454839276ef2129a3b5138cbd56e8 SHA-256: df839a7ad196fc3883e8af4802b9514369a612be5f59ffa62d6a5199818705ca
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a suspicious domain, likely intended to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, contains text referencing 'Frustration game 2' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=frustration+game+2 PDF link annotation
    • https://site-1168066.mozfiles.com/files/1168066/yahoo_weather_nyc_extended_forecast.pdfIn PDF document text
    • https://site-1176532.mozfiles.com/files/1176532/aimpoint_pro_red_dot_reflex_sight.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/jjQgfpl/new_york_city_fc_stadium_news.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_5f9f7df622af5.pdfIn PDF document text
    • https://site-1168150.mozfiles.com/files/1168150/juventus_roster_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/hjjxjju/voweti.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/2HjgauH/27519258268.pdfIn PDF document text
    • https://site-1195159.mozfiles.com/files/1195159/teacher_assistant_pay_in_desoto_county_ms.pdfIn PDF document text
    • https://site-1177329.mozfiles.com/files/1177329/color_bump_3d_level_121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5fbab2c6d4c7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/tesajorefimo.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/momajewagupadonifoge.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/chapter_3_bipolar_junction_transistor.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/39817995268.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/gufawopulev.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/tamasha_video_song_full_hd.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_off0000d2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A5 5060 bytes
SHA-256: e0dfb8efa5644e96f8b2df589b1d6ffe411558b9adbab0d79a07d7c1fbee5256
font_01_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 10592 bytes
SHA-256: a54092d1220a1a2cc548051bf4883de77a63597dfce546c51d7e53c6ea73caf1

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