Malicious PDF — malware analysis report

Static analysis result for SHA-256 866fca20f0c5e3ee…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 17:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40be04a9861c7e83942d0c2af3333cde SHA-1: 865d3ff779759016c0ff635e8a9d87fba80d68d3 SHA-256: 866fca20f0c5e3eed0470ab0342cf62762bfcdc7dae90889fc4951b1e8d07cdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on disposable or unknown domains, suggesting a link farm or redirection scheme for phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://przyklejki.pl/userfiles/57841669552.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/gesaxefazizoladutabun.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/65698554021.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/subuxebe.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/zogexeroxajivu.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/34032096174.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/93175896215.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/xugulizejupetoxadegixu.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/wonasonegakebudiledebe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f326abc458---ruruvozudib.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/basire.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/renefupewapa.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/58447424250.pdfIn PDF document text
    • https://adikkedua.com/contents/files/25999933648.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/lijozezogosinikesavo.pdfIn PDF document text
    • https://seger.cz/userfiles/file/12341232544.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/fujibibanimofebofigasadul.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/bosuwoteredetesepi.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/lamedajulu.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/biwofoxojo.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/67656206388.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/jiwojuwivalu.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/jutot.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/31662542511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=inshot+app+download+apkPDF 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_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 10296 bytes
SHA-256: 25d0832721b016cafe48ede64969ca16a12a5e4ee5513e67b1774a88351c55a5
font_01_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 17528 bytes
SHA-256: 7abd7b2f48773eee2bdb0aeb622320caa01ae7f0353388d06b7bc58f7b806e1e

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