Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99a952a246342d6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 02:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f4eb8040596184f76a831fc36b9f96f9 SHA-1: eff42dfac593a82a8f9042aa10b541991760d192 SHA-256: e99a952a246342d61d94d5709ea57a54477c33480de2f64a274793db1ee29e26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to obscure the true destination or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the high number of external links point towards an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://sunil.kr/uploadfile/fckeditor/file/lawaxutizolazudewe.pdf In PDF document text
    • http://sbriz.ru/userfiles/file/wagovarowowinibuzorawuxe.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/86378281340.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/kilawokesoragujusaguw.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/teletajajudegatoga.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/xudox.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/98533601659.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/luxiwebetinozom.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/vubevefetumuwa.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8206adc6---69021249295.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/vofivedutadifumatatosol.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/lijofa.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/37635881779.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/reremajepopaxew.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/3059501887.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/nukozenewijuwaluzerupiki.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/80283711537.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/nejotobemopexol.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/47531256872.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/dufezejurovokoda.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/60778595003.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/daluzutirilikazi.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/527349610.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/6961471995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+lean+product+playbook+pdf+downloadPDF 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_off0000d4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E5 10952 bytes
SHA-256: 39d2fbdbd847e03b0fe3fcc48339f5d4223b135b32faaeb710b02baeba1b41b9
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 18068 bytes
SHA-256: d8bbaad1edafb4886c966a55a843642bba90fcadb2ab189527167b0a1d916748
font_02_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1