Malicious PDF — malware analysis report

Static analysis result for SHA-256 b724989ed8f8b34b…

MALICIOUS

PDF

69.5 KB Created: 2021-10-04 07:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3f7be2135297899a19597b264aa1c4ac SHA-1: 2e969659deb6fbabe7a6202035bc2d41f1a7f8ba SHA-256: b724989ed8f8b34bf500c7943ca4136bce7a9b6795309a8d13894a36a34f6093
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which are hosted on disposable domains and appear to be link farms, suggests a phishing or credential harvesting attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://colakcivi.com/userfiles/file/rubobebotut.pdf In PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/sapiliv.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/fumabamur.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/68210818716.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/desabalejasododasik.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/jojisajifekenonef.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/sesugixidaferixaki.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/61159779352.pdfIn PDF document text
    • http://congluc.com/upload/files/89037099892.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/95586389204.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/pavuxujetedewumemajefi.pdfIn PDF document text
    • http://zenithmetals.com/files/kaxatemosimajimoladoku.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/nogudomaf.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/xaxiradaximazulemapiliz.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/bexizupelixorekan.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/56865209727.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614e902d95e1c---90929044713.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/tifalobikigemulule.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/potedive.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/12641506423.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/lubitakujavujiz.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/51880132245.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/11881434221.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/65782262993.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/86620492746.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/23931318610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=crazy+car+racing+game+download+for+pcPDF 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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 15076 bytes
SHA-256: 4736e49ab7b3398acf1695fb851cebb058f96d0a495a8e94a09dfbd11157e6e0
font_01_sfnt_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10988 bytes
SHA-256: 7ad2ec0a2db90ac5f6d28d472914aab1c027bde9164d9265b459c039461ababd
font_02_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1