Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a2810b8d73d51e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 08:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2dfff3e44e9b750f5c745a7c5d6c6a47 SHA-1: 870383b0a98fe385a9f2e4291ccc736115d9bd4d SHA-256: 36a2810b8d73d51e50e1fcd2c783f2537ddefcac3ba10891c98cc6a282649a23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple external URIs, with one pointing to a disposable domain and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://fqcycpa.com/jingkelun/userfiles/files/20210912004812.pdf In PDF document text
    • http://henskeschildersbedrijf.nl/upload/lolukanafasamupiba.pdfIn PDF document text
    • https://photofetimages.com/torekipajukamu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0021a1322c70e3a01d1e4ee5d2157c41/xisetap.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/jalitozakemuwagenib.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/ziwevabejuvarazadejepa.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/87646770747.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/96657463789.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8afa587fca799768ee1ccb9fe1bec61/domarixodo.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/39069211741.pdfIn PDF document text
    • http://chpcentre.com/files/file/wigaripilaki.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/10843273995.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090900450773499.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/4670873040.pdfIn PDF document text
    • http://acril.ru/ufiles/files/gedufibafasag.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/butidigidupi.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/porowopodepunikesudomak.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/gupunifudisa.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/gukun.pdfIn PDF document text
    • https://ms01bet.net/contents/files/bolop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=total+history+and+civics+10+icse+guide+pdfPDF link annotation
    • 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://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_off0000b33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33E 16348 bytes
SHA-256: 339e59c5573086562c399afce5935428c0c6d71b3597e557068add466ae730a0
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 11316 bytes
SHA-256: dfaad1e7222099510fc5bfcee0d6caebe97b32459d2dad4db9178b3e5dc08c34

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