Malicious PDF — malware analysis report

Static analysis result for SHA-256 721a1029979f2370…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 12:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: abc83809cf51fb7d8dc423a1b30d61e1 SHA-1: 30f64cfbbc91c725b1ab7e39361aed6bd7e4d027 SHA-256: 721a1029979f237073229565146c7483fb4e9f2d0c12625f5afd6b8f8164576b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. This suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://saaretravel.ee/images/file/fawozimufumes.pdf In PDF document text
    • https://dudikom.pl/userfiles/file/bawuwowevodetixof.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/95248158149.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/6884092848.pdfIn PDF document text
    • https://mbbs.hr/files/nitowurazomase.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/moripufujul.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145df693a77a---73100736123.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/roked.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109010924081434.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/11445238361.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4d2a4eb18cf99834d6e7b425d45526d/34783516716.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/91641552489.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/82564644071.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20935234582.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/belupuxuwusirakolunu.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/36033870770.pdfIn PDF document text
    • http://chenruichem.com/upload/files/fijijonefop.pdfIn PDF document text
    • http://greenglobepms.com/uploads/25988445936.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/41337200259.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/46270466234.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/remenilapakawozikoguro.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/giwugajisegepilajugifa.pdfIn PDF document text
    • https://cap2013.aseat.fr/userfiles/file/poxisuridapatulepuw.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/xebokix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+hack+in+mm2+2020PDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/wadep.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_off0000b50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD21 10460 bytes
SHA-256: 87979921b1cff842d02211c53ed3f5488d25a1872c63d127ab8556e916104a3e
font_02_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 16316 bytes
SHA-256: 818e5c595e090a3deec26ff96647c835867adf04a91a3e0b9e7559611a4200f5