Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4aea35a942df87…

MALICIOUS

PDF

80.7 KB Created: 2021-03-08 12:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ed36e6c8330beee4867b085eaae1c742 SHA-1: b2166d944460bd5e6016dced25e3c2bfe6308b71 SHA-256: 0f4aea35a942df87e766553cb9161291061f45acc798407e02d0289f351ee870
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1534 Steal Application Data

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials or MFA codes, likely by directing the user to a phishing site. The embedded URL 'https://midufefew.ru/award?keyword=stock+market+crash+definition+pdf' supports this, as it masquerades as a definition while likely leading to a malicious page. The PDF also contains a large number of external links, suggesting it's part of a link farm designed to improve SEO for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://midufefew.ru/award?keyword=stock+market+crash+definition+pdf PDF link annotation
    • https://cdn.sqhk.co/bivuwusim/jdUighe/gestion_de_pharmacie_hospitaliere.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/7640188.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/wO5Ogcy/80142965252.pdfIn PDF document text
    • https://nuxajitavira.weebly.com/uploads/1/3/1/8/131871558/9843065.pdfIn PDF document text
    • https://nujazovarurep.weebly.com/uploads/1/3/1/8/131856890/3e6f03370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fdc6abde8a00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5ffdc37379fef.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/ifgihhQ/pewegagofubebivajove.pdfIn PDF document text
    • https://litazotivov.weebly.com/uploads/1/3/0/7/130740097/7b4abf191cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fee28e1a522f.pdfIn PDF document text
    • https://cdn.sqhk.co/vizefejij/FXVjjYu/87561045919.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/giwopoxowugobuw-vijozom-gesudewuzado-fafafem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_600a652b87b49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jeponowon/chale_aana_ringtone_pagalworld_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/zajawikuxafi.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/formation_en_alternance_en_anglais_wordreference.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/calendar_printable_template_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/12819749139.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/travis_county_appraisal_district_protest_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/sifumelexepen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 5320 bytes
SHA-256: 6d76d6ba1488faa81234fca4645ec4bfab05137a5255a0728b91a07bdd49c2a1
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 11328 bytes
SHA-256: 0d25160b9de925a49529309c9344b0d98e680f97d3586f9b406c173a07b7dcb4
font_02_sfnt_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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