Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fdca3907646754…

MALICIOUS

PDF

69.3 KB Created: 2021-09-13 12:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94a706bf8a4d948e96d9555aee068297 SHA-1: 853bf449aa575b01855cfdd61d0d353e2797b286 SHA-256: c3fdca39076467547d28d758be3d5c6391873ac654e94cedec99149306ea1888
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to potentially harmful content or facilitate SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://casaperferiesantamariagoretti.com/writable/public/userfiles/file/56653530764.pdf In PDF document text
    • https://edusfera.pl/upload/file/19939475837.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/rejebubofewekulimajebagu.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/felofeb.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/92492083993.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/nasozituxemufagewezatiso.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/91699296580.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/24378705491.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/gefixarokufamul.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88982907676.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/20316778167.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/bivij.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/81554853625.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/69773409579.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613c3583598d9.pdfIn PDF document text
    • https://buka.ru/sadm_files/rawunume.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/45fb94dd2ba608ff7e10d42edd2fd120/48111597288.pdfIn PDF document text
    • http://meditopthailand.com/file/80640757317.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/77381994461.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/85422951432.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/43596348352.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sunes.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/82373764009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+kodi+player+2020PDF 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_off0000b1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D8 10780 bytes
SHA-256: 45b3e3b0aa0e9d260a89e5cd7cdec44354e13ad743091d7fdd273694fb6e98d9
font_01_sfnt_off0000caed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 14772 bytes
SHA-256: e00da43e10a901eeb3b48c73c6ebf3c04d52223dcf8852086d7891f09e27e22d
font_02_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1