Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa38c651291b163…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 21:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73b0f6dc469341443dd5106a2aa2552f SHA-1: 2f2e826f643d83aba971d365e68bfe88a56f60e6 SHA-256: dfa38c651291b1632eb4bb1b90facb3381b88dbec9fdbd1b4b056647fb6b15f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://velapower.com/glwh/UploadFile/file/2021090215253173499.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8186cc214bf6d9d4a54c16a127473216/23471290846.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/dexitetiv.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/miveginuxotusewonaj.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/15976348268.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/selelizapepasuromo.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/98710208182.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/18969594863.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/zabudawe.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/raguvo.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/34768215165.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/69212843927.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/xufev.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109132236398455.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/lulodevijamawib.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137b1a7f1b82---62351112245.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/70706531166.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/6388363482.pdfIn PDF document text
    • https://t2sc.me/userfiles/dibisanabebuxufimir.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/fuwapiruz.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/mosogokujejasomofuneve.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/27757810668.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/38848952047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=all+mobile+android+appsPDF 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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 17820 bytes
SHA-256: bc5a884a5190830220323de283f2535b258056b1a80c34ecedec361babfc3538
font_01_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 10576 bytes
SHA-256: 1da510b600b9f2c86185661fc3045c493122499c473a177f99af9c3de6f8d3e1

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