Malicious PDF — malware analysis report

Static analysis result for SHA-256 deec7dde999866b7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 16:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a6f508daebc8792921ba7784f20d888 SHA-1: 21b9ea84f78ecf2ee1c52094df806f2629797438 SHA-256: deec7dde999866b716b055c1204903795e6f59f60a7cfceb772e9c94e1830914
134 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with critical and high severity heuristics indicating its suspicious nature. The presence of embedded JavaScript and numerous external links, many pointing to PDF files on potentially disposable domains, suggests an attempt to lure users to malicious content or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea of a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://afghansolar.com/userfiles/file/19059649737.pdf In PDF document text
    • http://anchor-m.com/js/upload/files/19926730634.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/pusawumu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/kiguzasosim.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304ce213883---10897928239.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/34288867246.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/33988374456.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/32502936831.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/54731106113.pdfIn PDF document text
    • http://dsraxys.com/uploads/57922111378.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/moferofoxutudubam.pdfIn PDF document text
    • http://plncse.hu/php_data/file/1675820325.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/jederi.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/9454753357.pdfIn PDF document text
    • http://szwygs.com/upload/47224224639.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/942877576.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/pesogosixerewadenafarew.pdfIn PDF document text
    • https://majubesar.net/contents/files/sevuxekapubedopu.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/7040319948.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161375c1a2c421---luwelebamokugas.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/16680868720.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/suwuvavagi.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/95713988913.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/95758051813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mard+tangewala+full+moviePDF 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_off0000b57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57B 10776 bytes
SHA-256: e67d5e9003fd46441e8bcf2f1ccab7e18df505c02ba19cca2578c6f4ab8ad614
font_01_sfnt_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 17324 bytes
SHA-256: a01ea7a281f3ec064b5b55a9b8892703f90fa51be2a607e7af3eac0fa0bd31c4
font_02_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1