Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1a15088c133d83…

MALICIOUS

PDF

98.2 KB Created: 2021-09-19 09:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3948990c010f678e53baf62a45521382 SHA-1: 8fec818ef81966c6c53fd9b044c00e1dbc7164da SHA-256: 8b1a15088c133d834cb780e2774fc22c5783222cc38951d96a368e1b1a704627
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to distribute malware or phish for credentials under the guise of software downloads. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=download+minecraft+pocket+edition+versi PDF link annotation
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/59820991668.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/danudufuwugaxunav.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/49100280490.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/94733680060.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/bamidexobeko.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/rokosavubabigudafidemu.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/43116866733.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/lutaworigowexomegof.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/40506342124.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/14440048117.pdfIn PDF document text
    • http://net-work.cz/data/file/daxojitere.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/91068910874.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87959231449.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/65960574797.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/maroruluzoviluru.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/gafijozopototiw.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/wadefozekigidolilejaz.pdfIn PDF document text
    • https://aildf.in/userfiles/file/mexinabepivuvi.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/20890777652.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/75988360443.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/86340210944.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/tevefubutizoxifex.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/95758162346.pdfIn PDF document text
    • http://trubaopt.ru/content/file/70237686945.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/zetefolukosatafojejipova.pdfIn PDF document text
    • http://baoveantam.org/upload/files/fimemagejofadafepi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kipetajuwufekavutimekub.pdfIn PDF document text
    • http://retailcop.ca/files/90285823718.pdfIn PDF document text
    • 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_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 17348 bytes
SHA-256: c0628e239fdd42ca1eb0ee2c3e89e6145a70873302954b7c08e71f48dd88f2ee
font_01_sfnt_off0001490e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16125 11028 bytes
SHA-256: 40e905e92fa5bb6e32539b504f72c3a5af89fef59177e5dfa62f0f9049a075ec