Malicious PDF — malware analysis report

Static analysis result for SHA-256 457ec59ba74ab9be…

MALICIOUS

PDF

101.8 KB Created: 2021-02-27 17:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1a83456af9a7550a625a831bcfd91752 SHA-1: da859cc5d5b31d122ee749ad36b034d5d20cccc4 SHA-256: 457ec59ba74ab9be66d344b2f9b49763c13326df1d04121ce0421f35e1247fba
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'gimoguvi.ru' with a query related to game cheats, suggesting a phishing or malware distribution lure. The presence of multiple disposable hosting links further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=starcraft+remastered+cheat+engine+table PDF link annotation
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/0e888445cf.pdfIn PDF document text
    • http://naturapple.space/pvpets_tank_battle_royale_modkuw3n.pdfIn PDF document text
    • http://zobegodu.iblogger.org/farufevitodovizigene.pdfIn PDF document text
    • http://tupakewufitid.iblogger.org/chi_square_test_reporting_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_6033855bc9772.pdfIn PDF document text
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/ec03376a699a69f.pdfIn PDF document text
    • http://yesstore.pro/12463013327nov5y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_60062fe2e151b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaxidos.epizy.com/auto_sync_onedrive_android.pdfIn PDF document text
    • http://poresiz.epizy.com/remavepefiru.pdfIn PDF document text
    • http://daponub.epizy.com/80933069152.pdfIn PDF document text
    • http://wevedikelu.epizy.com/lipojoxibukotejemida.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/grammar_review_quiz_with_answers.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_off000149e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E2 5676 bytes
SHA-256: 2b75845eac7ae9776728456ec9c163f58180a2597dfa4c4160ca0082a0f5c554
font_01_sfnt_off00015d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D01 13132 bytes
SHA-256: 728de90d80dfb181fef139a35c39047b35c6680b98bdb81578a93184917e82ef

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