Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ec8a6b6648a840…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 04:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8043bed2f9a130234f4257bda7db808f SHA-1: 18d800f7067029b924c33462275a2c892a328a86 SHA-256: 90ec8a6b6648a8409b5e7f97899082f719c94022ff0fe02dc8c30c8790177bf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=principles+of+economics+bba+book+pdf PDF link annotation
    • https://triosms.com/userfiles/file/topupepatulutog.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/31155398816.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/91673327021.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/3196466111.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/88374493553.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/jugeka.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/81660485360.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/22639376003.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/9798445706.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/37584960485.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219245034.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/2709888878.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140e83274953---suwigeruvevamiwelu.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/99570247840.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/suredezajib.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/dofidorazo.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/87864681034.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/jamemukud.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/8477300170.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/uekmehrnpnm01ah954gomahl0r/fatewinidese.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/90875801711.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/55706345989.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/nimej.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/tofunogiluzuw.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/21112172208.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_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 18344 bytes
SHA-256: 7d9b052f8aa1b84911ec050e4cabf4f16b6df257ce482cdcba5d0f876c2b9641
font_01_sfnt_off000118b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 10916 bytes
SHA-256: 536bd174c796d6595095c4ceb6ac0835dcae2ce6f0f4bd1961047e184ff23a49