Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e40b2c4cde654b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 04:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8b2e62d973503c90e93b61b8935fb26 SHA-1: 9e99411377bdee6c95d44870373d66c4bafbea0c SHA-256: 91e40b2c4cde654b3dcbb517e996df72372c8b71395187aadc52fef5752cb6dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=assassin%27s+creed+identity+mod+apk+download PDF link annotation
    • https://drjou-vc.com/upload/files/xuzorovizupizu.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/xesewep.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/923dee98ca69fcf324e9b9ae992c3bab/venumejufabuvirum.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143569c71484---kufelonodipivizunuratajow.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/27936125012.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/39247986097.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/ziparowulegisopadajimux.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/kavafe.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/furikikev.pdfIn PDF document text
    • http://metall-press.ru/files/87842780818.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/tudifixe.pdfIn PDF document text
    • https://mcsfood.com/images/file/44592151728.pdfIn PDF document text
    • http://teraval.cz/res/file/40217389110.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/12003303334.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/79522803415.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/xaritaposabat.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nevigekakeve.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/nameb.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/madekepa.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210907160058.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/66526525593.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/54312918893.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/10376786509.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/43925188167.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/7569594195.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_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 10984 bytes
SHA-256: 193ff5f3e54dccaa1fa9107275cb4f25214b6efdd1c0ef17e2d7d6ba178de90d
font_02_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 17448 bytes
SHA-256: 7e652b684eb272110678caaa9a49644cf6a67e5b47ad33b477757eea085876e7