Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8feda0a7a2bb4f…

MALICIOUS

PDF

78.7 KB Created: 2021-02-26 05:38:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c339dd62c4725d5fef21a7fd5358a40b SHA-1: 1615450f520b80c5aaaf7d172f73a36556b26e52 SHA-256: ec8feda0a7a2bb4f150c1c2a5274e10f92957e9c6cfe6ea349fcec466476274c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm used to distribute malicious content or phish for credentials. The ML_NYX_PDF_MALICIOUS heuristic with a high confidence score and the ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=incremental+plagiarism+in+a+sentence PDF link annotation
    • http://legendbilisim.com/32302489433nxncj.pdfIn PDF document text
    • http://legendbilisim.com/lubuvoxibetazolujod28tbv.pdfIn PDF document text
    • http://jilet1.club/xawejunubudz129.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/78438638962.pdfIn PDF document text
    • http://vezapom.iblogger.org/latest_tamil_melody_audio_songs_free.pdfIn PDF document text
    • http://katermore.ru/english_grammar_practice_app_free_download3z6ir.pdfIn PDF document text
    • http://habirovradik.ru/15376154567i5srj.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/27588974969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487423/normal_6011ded31eecc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxokagad.epizy.com/bamiditux.pdfIn PDF document text
    • http://varaxekewuveza.epizy.com/ludox.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/liabilities_and_assets_balance_sheet.pdfIn PDF document text
    • http://gobetenogal.rf.gd/lista_de_verbos_en_ingles_conjugados_en_presente_pasado_y_futuro.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/64215506446.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/solution_manual_for_introductory_econometrics_a_modern_approach_5th_edition_by_wooldridge.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/boi_account_opening_form.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_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 5192 bytes
SHA-256: 5564a19f62aeaebf0bad4727e510638b4b542c17d5b758f32d7be54785065662
font_01_sfnt_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 10152 bytes
SHA-256: b1e58bf88e0df04aa5cb03dad66f56cf1c13e6ac19f210f7e935cc77aa57a591

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