Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7fa1acfdcc96ab…

MALICIOUS

PDF

86.3 KB Created: 2021-09-10 08:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e81672eec32501569d1b7a65740f71b2 SHA-1: 321403db50ae5ca5d28c41b7fe99427d69d372db SHA-256: ef7fa1acfdcc96ab6f383fefeba782b75ed62f6d11e011ec9179b66df541a067
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing campaign designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vdadanang.vn/app/webroot/assets/files/90308973760.pdf In PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3702480a---45886246013.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/45359280033.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/pujojin.pdfIn PDF document text
    • http://unsersohn.ch/images/file/3520314481.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e37ab43048856b6fba3fdfd9b53ab965/nonuropuzifi.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/86186451135.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/xejuwejagowiram.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/fajikifazefabaz.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/87132509780.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/99208514481.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/denaxelugowixowo.pdfIn PDF document text
    • http://ippon.lv/uploads/File/suzadizidefojepidatuval.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/dunewukopoderodiwediw.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/taniwopuwoz.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/mibolufolepuwopazojato.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/24365777069.pdfIn PDF document text
    • http://e-menu.hu/editor_up/zesasivitutijojuxo.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/11530754948.pdfIn PDF document text
    • http://strandedtattoo.net/file/zorazewa.pdfIn PDF document text
    • https://sadex.pl/fck/file/rusavonuxebuwunetuvis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+best+weapon+in+watch+dogs+2PDF 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_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 18068 bytes
SHA-256: d27168636432cf02a5135c583fa7bf2195475a449be5f899aa831d5b9c28ca3f
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 10988 bytes
SHA-256: edef63361bec060a0fc46fe33a771f65f3df9d26c3aec0c7604a9dce10068861
font_02_sfnt_off000133d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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