Malicious PDF — malware analysis report

Static analysis result for SHA-256 33634026f76b54b7…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 05:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d481192fa54636fb3c1126c43ddea1d SHA-1: 20589b6da075f0470bac6399cb02e3859fc324d5 SHA-256: 33634026f76b54b72fcef0fbd8d1cf3e541df9e5cc3a7d380a4786eb72f5c6d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://vpsystem.com/files/fck/87459674957.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/dusug.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/47528464655.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/65214360447.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/37894249369.pdfIn PDF document text
    • http://splogservice.ru/content/files/tiwuxos.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/35465695661.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/kosofunazura.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/8134537587.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/43132568369.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/debudugalimupavovixegalo.pdfIn PDF document text
    • https://palet-school.com/files/files/55075562279.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/67808230639.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210919045133.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/bekufefigutapena.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/miwuvogewoferaw.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/94455000824.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lesidagi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/xoluduso.pdfIn PDF document text
    • https://nexapos.com/upload/files/wivexufararizowan.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143e71c8f0f6---sabaxarode.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/57042125233.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/zorali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=icecream+pdf+editor+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/biludu.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_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 18104 bytes
SHA-256: 5fec58ffa3ca7a18851faaa607d0c954ec911ad13e0ee2ccbc602a4a39f3dfb0
font_02_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 10648 bytes
SHA-256: 56d1344cbb619a6b450f58fb2a7207b70078dbd86f9bbb97b2d95773dc67b0bb

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