Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c62ceb61485709…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 10:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8e0e7e1ebceee3a3a7693aec952e566 SHA-1: 09bd22952fc5c0702b6408b72aecbb29a6b5057c SHA-256: 78c62ceb61485709e45bcce54f833d8a58840fa5095ba79cca265141d9076e03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=py+bruice+pdf
    • http://laboratorioshamalab.com/userfiles/file/xominosobagedesakapamo.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140d70df2a13---jesemenumudifobaxalu.pdf
    • https://mobisteelegypt.net/userfiles/file/94227561066.pdf
    • http://kerrya.com/ckfinder/userfiles/files/80627917532.pdf
    • http://ankurgroups.com/userfiles/file/zetirotupozozomokoz.pdf
    • http://gt-outillages.fr/ressource/site-image/files/lirij.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614494d8b9ed5---webawiv.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/rexiparifupowuvilunozuvin.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/dafaviwomunowaxesuzem.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/57477265199.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/27693013447.pdf
    • http://movietek.vn/hinh-anh/files/64168693218.pdf
    • https://leganordavigliana.it/uploads/file/18869128332.pdf
    • https://chennothinterios.com/uploads/file/20629698684.pdf
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/kivowolaxakebupigosu.pdf
    • http://domplus.su/userfiles/files/79613266418.pdf
    • http://wsm.hk/images/files/guvexuriwekiguj.pdf
    • https://semangkamerah.com/contents/files/77307671308.pdf
    • http://onestep-tokyo.com/userfiles/file/fakonuvomasutanikuv.pdf
    • http://surausa.com/uploads/files/majatuset.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/73550945902.pdf
    • https://suativisamsungtaihanoi.net/upload/files/64964738642.pdf
    • https://groupunsur3.com/contents/files/ruzuwi.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/78131279445.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD50 16792 bytes
font_01_sfnt_off0000d562.bin
d3ec81fc40555837044fedfc44bb35d3e7c9438e4cc31a418d44c2a997591cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 18272 bytes
font_02_sfnt_off000104c1.bin
4a6e57dc5d2abb41d03f16851da728213b91d41257c8b13deef4ab5d2c7ce07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10268 bytes

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