Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ea7d28e8910e52…

MALICIOUS

PDF

135.4 KB Created: 2021-03-16 18:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9417a31e08284a5a5a86057cd14ea415 SHA-1: 560bebf9dc873073336421fc7d92eb2f4c4693dc SHA-256: 23ea7d28e8910e52a19abd95bdd6c55051c6963adc3a8f326cf8f395b3813df1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9730

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://dugedepap.ru/award?keyword=geotechnical+laboratory+experiments+pdf PDF link annotation
    • http://andyhong.blog/1632058402395z9r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_601ef181496f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_5fd2a244429e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_6040e0b75b03c.pdfIn PDF document text
    • http://rarurude.22web.org/85495268055.pdfIn PDF document text
    • http://juzajikadig.22web.org/14399297039.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/gdhgjfU/45172246290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416938/normal_5fd7623e399f6.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/hfigChi/microsoft_sharepoint_server_2007_download_full_version.pdfIn PDF document text
    • http://copyrightproblem.com/kibixefekirujegifoloexnvq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_6035d27a22b28.pdfIn PDF document text
    • https://cdn.sqhk.co/rujojumex/ihijrIz/block_master_for_minecraft_pe_pro_apk.pdfIn PDF document text
    • http://mjawebdesign.net/chromatin_remodelingrpsgg.pdfIn PDF document text
    • http://health2health.online/simon_companys_year-end_balance_sheets_follow_profit_margin_ratiosgj3e.pdfIn PDF document text
    • http://duwibuzawo.22web.org/mipifalelib.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/jsjdgjy/dubai_car_crime_city_grand_race_ramps.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzeparuzibez.rf.gd/first_encyclopaedia_of_islam.pdfIn PDF document text
    • http://gevazobi.rf.gd/english_conventions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/minecraft_battlefield_mod_1._7._10.pdfIn PDF document text
    • http://wevevaviz.epizy.com/adhyaksha_in_america_full_movie_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/gemisixolanakunepusofa.pdfIn PDF document text
    • http://liluratomakawu.rf.gd/jurofabetezawuromezegibos.pdfIn PDF document text
    • http://zibarubo.epizy.com/menate.pdfIn PDF document text
    • http://laxolivavaru.epizy.com/bizifulemibejaga.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/symmetry_practice_worksheet_4th_grade.pdfIn PDF document text
    • http://buwaveb.rf.gd/63196670505.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/donikes.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/47110585266.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001987a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1987A 9840 bytes
SHA-256: 90b903eb1410d04e4e7dbf2a85f7868a7162f368ba4a5cc8bc14de95d12c53b0
font_01_sfnt_off0001b33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B33E 1528 bytes
SHA-256: 64d53b4318ba7dc869bcefe2c6c56431e6e12bcaf96a32242cfa9e17b755ba3b
font_02_sfnt_off0001bb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB06 5736 bytes
SHA-256: 2cf3b19b1a8467b83951cd8443a5e89c2880cb3b1da94e2d58d388b1164b5b40
font_03_sfnt_off0001ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE67 12524 bytes
SHA-256: 9f6641be819b51b53515887319c45551c66651f491fd3db75c1401a974e12184
font_04_sfnt_off0001f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F90C 16148 bytes
SHA-256: 43953a3893a3c660bdf2e5f45974240835844d4c93f33037fc5f3a24d9d1a8ef