Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc8d9f1221725d5…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 03:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68b95de4ca8baa8ec8a1851831f44e69 SHA-1: d4e29827fbd88dc7f37e1e8db1e78a484e91590d SHA-256: 0bc8d9f1221725d548deaf0ac43733d1fefeb24befb958b6595431d0d049505a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://nomylo.ru/uplcv?utm_term=monster+of+glory+latest+version+apk+download PDF link annotation
    • https://sportcity.bg/webroot/img/content/files/gamixowolunapi.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/61938701073.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/xetexusilagu.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/maverutefixanikike.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143124a9d31f---7062795697.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/limifos.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/10471451608.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/kapazad.pdfIn PDF document text
    • http://saktigroup.in/uploads/91323768166.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/tifonejejasogadasagajejux.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/56211283278.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/zijosimepitomefum.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/relofuvezoduvin.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/46278970096.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/37574001028.pdfIn PDF document text
    • http://lawina-radom.pl/files/file/62789155744.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109191854147965.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/84049929685.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/82487784142.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/60855363659.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/vuzominegofamulekotefuw.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_off0000b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 16856 bytes
SHA-256: 4bf7bc0fc438cc7e2fd7fafe3d8c8941c2de33d545d86ccdcbde74f98e534a27
font_01_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 11024 bytes
SHA-256: 35c7a0b11db427a6f90c478274cde91d83ac545429c59642350e2ed5b7f16fe7

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