Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a3ea63d943cf25…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 05:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0daf92e9861bb336024317bb7d8db0c5 SHA-1: 28c01fca469fe158ee508e969a089504bbc153bb SHA-256: b4a3ea63d943cf2547e33df9f4c5997076d5dd2b6d9cc652495878e65b929090
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/19791958492.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd3bda8c6f---jetowepa.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/17825005810.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/xefeg.pdfIn PDF document text
    • http://mrybalko.ru/files/widemidizitetigu.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/73688451080.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/wibojezuruxikubuneg.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/282242038.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/29460131602.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/64549724358.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/54408982627.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/24832004865.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/tumerotepixudu.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/81563131159.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/87977851542.pdfIn PDF document text
    • http://sdes.in/uploads/waxivudekitodasadafi.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/59485348398.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kopakagozozenofa.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/59574053797.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/lifulumavanako.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/kojigadine.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/63295275318.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/sifijunupezisorojoberevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+download+moviebox+on+smart+tvPDF 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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 10796 bytes
SHA-256: 3aefcda2f014845330c6a01147fd10bf3f03b582389132e7f744e6286aceef21
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 17860 bytes
SHA-256: b1ce9acbc6e99dfeaf2286583cb097600abb14cac8570008bb3662534bc41f00
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1