Malicious PDF — malware analysis report

Static analysis result for SHA-256 81785cc8d92a56f2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 10:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55933fc168b30d602f7f0562d820cb9c SHA-1: eb75cd93b671f1853cbb425e8de4bd55e1290ce8 SHA-256: 81785cc8d92a56f2972ee7dabad09582d4b5e14d524972c090219599db2c8d95
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045df2fcfb---5819699920.pdf In PDF document text
    • http://groupkaishan.com/d/files/kavapivifixewelas.pdfIn PDF document text
    • https://tarsiman.ee/files/file/49299894439.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/nemanavesinovofawawebufig.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/bajojibapag.pdfIn PDF document text
    • http://apicn.net/upload/files/69868753382.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/mujexepoma.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/dogaloxoxifigovupiruxit.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tenexu.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/5584348403.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/bubelebobunixozufitexefex.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/44589257769.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/vewilanusepof.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/kuxijufamoni.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/ropupuvidede.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d580fbb910---lebupizot.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/20246740324.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/90879320356.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/99844664410.pdfIn PDF document text
    • http://guchen.ru/d/files/1357650796.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/24353689987.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29735451392.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/puloxovodotimunatuv.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/bitunanawi.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lunisamulabawopupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=disable+chat+heads+facebook+messengerPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 11156 bytes
SHA-256: 850ffab2c758eb78e1899e78425cbcf21498b3f4193684c8108f2ea5e162d1fb
font_02_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 16992 bytes
SHA-256: 4493318070ae8c1c81b1cc915cd53e774defdbe8b1f32c1c04c748eb6daa5c31