Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe122786cf7ac08…

MALICIOUS

PDF

81.4 KB Created: 2021-02-16 08:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 967325501ecc79d80721f99da67866a0 SHA-1: 43414bfc5bec335ed51e9b508a55467502255dde SHA-256: cbe122786cf7ac0876e875646eb22a4d7f8f04fef8136cc48683077b4680f2fb
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=how+to+do+you+find+the+radius+of+a+circle PDF link annotation
    • http://reduslimitaly-ufficiale.site/ragijesomupetitezooahl7.pdfIn PDF document text
    • http://filanion.online/nissan_xtrail_2011_user_manual2vzlm.pdfIn PDF document text
    • http://prod-fruit.space/75511750136l6bx7.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/sSggAMT/wedding_cake_topper_ideas.pdfIn PDF document text
    • http://meziradidanaru.iblogger.org/fopupikidarelerowemovi.pdfIn PDF document text
    • https://nuvefozilif.weebly.com/uploads/1/3/4/7/134733792/revepojupewusase.pdfIn PDF document text
    • https://zalinojawovuga.weebly.com/uploads/1/3/4/8/134886974/popujosuli_potuvum.pdfIn PDF document text
    • http://sokolov.fun/purizibona4u1v3.pdfIn PDF document text
    • http://fruit-italy.space/alpha_centauri_hacked_clientyx8to.pdfIn PDF document text
    • http://legendnat.space/5474502175keod4.pdfIn PDF document text
    • http://matcobzor.ru/vekufefopupofonepbpi9.pdfIn PDF document text
    • http://alfa-quest.ru/davazutuvitegignjqwl.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/fulazelof/97370796975.pdfIn PDF document text
    • http://gowojurepola.epizy.com/math_logic_puzzle_with_answer.pdfIn PDF document text
    • http://sizikukot.epizy.com/zufex.pdfIn PDF document text
    • http://pedirutufojo.rf.gd/buluzikogemone.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/sijenitokukeniwa.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/watabu.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/nejunenilawiraxupugarani.pdfIn PDF document text
    • http://vuwejamadadodi.epizy.com/english_letters_worksheet_for_grade_1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 5264 bytes
SHA-256: 85b4972e5d2ce9938303cd5ab6b51fefcd64b3bc549e392eb23bbdd9f2b4c7c4
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 12012 bytes
SHA-256: be91ae93381d263f53be1456207dd6f7a69d85e555dd9fd5adbf04cad78e6ffc
font_02_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 16112 bytes
SHA-256: 23e5e0a6ad5360bf10628433507e5aab34c42d7d900ccb2a5214949f2168b422

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