Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf793a0eaa1738e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 08:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7cd5616a3ed494f9adad4d315fe52722 SHA-1: f0f33ff29fd70b03495d71db8021b55e96a3ebd3 SHA-256: bdf793a0eaa1738e5437c562fea2445af85bbed57714683c56a61205e49381ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically flagging it as a phishing trojan. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://st-johnson.com/Uploadfiles/files/54178283308.pdf In PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/89580233298.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/19467705043.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161478de3b907e---99395765200.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/boxekukuv.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/lunumixabadirokalaxesoju.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/sokugelivukezovited.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/pobosejoxo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/seneku.pdfIn PDF document text
    • https://nada70.org/userfiles/file/97591068103.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/54032867638.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/45375699855.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/nifalepedamozifak.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/xadebutatifokorisi.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/levabajun.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1f01f33b8532aabc334419dd5f7623b4/62743732247.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/81970514578.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/7809640947.pdfIn PDF document text
    • https://hotelcorona.ro/files/xitaruxuzupedoma.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/91128058644.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/60092177250.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/73540048129.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/somin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+spracheingabe+funktioniert+nichtPDF 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_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 17792 bytes
SHA-256: 0767c981d6f03caca8248373ea560776631a5ccd18d325c6096db5c9db94cc7d
font_02_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 11168 bytes
SHA-256: 6c331d465ea014cd96a6d7a389bb667d92b7d632844b21089a6907b82fef5eda