Malicious PDF — malware analysis report

Static analysis result for SHA-256 db67280e0d3f3069…

MALICIOUS

PDF

80.2 KB Created: 2021-03-10 09:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d27d5b5f9cba9df523f82f3f11f58fa3 SHA-1: 1a1b575312f6aaee13282ab8a9a918ccca33b290 SHA-256: db67280e0d3f30694a0e982fecd180ac6932eb4aea51b5dbb9f673cc89870c02
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to 'nipisod.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'counter strike online multiplayer game', suggesting a lure to attract users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=counter+strike+online+multiplayer+game PDF link annotation
    • https://cdn.sqhk.co/nosimasiv/tihiNaJ/68216339529.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/uwUgdoW/73717301433.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/jg5V0gg/slot_machine_free_games_vegas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466165/normal_5fdd84a54d0e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464067/normal_5fee4ea876bf4.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/c6SQrha/sobesutazema.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421040/normal_5ffea2cb3f9f0.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/ggjhagh/97628579069.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/gKibzli/memodalinesuwisenupuvubos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_60142aecda905.pdfIn PDF document text
    • https://cdn.sqhk.co/pofadugilip/hUSIbmm/arijit_singh_latest_songs_2020_list.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/wizedumi/lutidafarijebezalafewodom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dfaaef-8510-460f-a586-f843984c3e02/47253115638.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/72523051369.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/a1296_3vdc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f994bf1c-86c7-42af-946e-a219788114de/zupotole.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/62333950351.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/bovejakoseba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d22c0b5-6403-4039-a5a2-31858855cc09/warcraft_3_frozen_throne_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/aluminium_oxide_sandpaper_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/appium_inspector_for_android_on_mac.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_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 5212 bytes
SHA-256: d24fffd7d3194a962612c828dfa347051ccb9110d7d0ec27c1fb52cf6c929e27
font_01_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 10492 bytes
SHA-256: 5acd9c1d96efb567a50fca13c9ae59048607d0a7c46018e3f5ef34abf3c19916

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