Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39ee5db9fa3f0c4…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 10:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8896e320fdcf7d676dacfcf6c1584657 SHA-1: 4ab7a8cd6ab67025d8509976ff73ac95204c492d SHA-256: a39ee5db9fa3f0c44832120d8df6db17c590d2586ce72854e66008c93e454d1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised or malicious domains, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links are indicative of a link farm used to obscure the final destination, likely a phishing page or a download server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jobuxabamulile.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sjj8oslu5he7013i8n2b9p3pn9/47522861234.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/fagebokoxunovut.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/43659503498.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_091518.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210905_3C764734D1E8818A.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/6922493502.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210908_0C63F8A01442B84A.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/siwipudazisakexolobuk.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbaf89ddc---65836205259.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/bigolamexoxekojog.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631595265_25fe45b082.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/xixarilaz.pdfIn PDF document text
    • https://qkon.ca/images/file/50469621578.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dipebuninatixunaxodenof.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/tizebedagetavo.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xuniritararemiwa.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/tulavuvobevuf.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/26312025479.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/pozemugopetavijokiwabemi.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/jesisazizutoxitoti.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/76112087529.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/sonud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hanuman+chalisa+dharm+raftaarPDF 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_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63E 10580 bytes
SHA-256: 8ea1083e5fac749e6462fae8959ab219049e843e4ff54bf9f142dfbbdef7934d
font_02_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 15772 bytes
SHA-256: 612aa72927c8e6972c07cdec6e875a86041ca09ae22748e5cc90a475d98caf55