Malicious PDF — malware analysis report

Static analysis result for SHA-256 912eec9d591c348f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 11:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 644f8f98eb91b1f70e3ff83c0cc43da7 SHA-1: 2ca787f7d56ee47c1708a1c53421b29cc080cc90 SHA-256: 912eec9d591c348fda0e897e818b225e82162909d5147b94f151f4bfd0a31974
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection pattern strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://presssimayeshahr.ir/pic/file/jajasuduxuluvo.pdf In PDF document text
    • http://chiangmai-clean.com/user_img/files/63986005948.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/weloweruwijefizuwu.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/67666832078.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_7ED114D8C57F8154.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/xixemebukoxu.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/jepofutofevuvivuw.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/zidelepagelul.pdfIn PDF document text
    • https://schodyperfekt.pl/user_upload/file/fanepage.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/93f5bff6ea43835c957d47c8e8bf76c4/zawix.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/20091865199.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/23021096067.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3d4a9e08---10592882881.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/55803889423.pdfIn PDF document text
    • http://futboltotal.net/images/files/81754174698.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16143ec74f27fe---luzetipo.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wugujepovafatejajufuveju.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/11640974287.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wukawijijedidunalezenax.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/01/86478963751.pdfIn PDF document text
    • http://orderkai.com/uploads/files/notaz.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/50968876037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=radian+change+to+degreePDF 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_off0000c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 16420 bytes
SHA-256: 977ba8314f938059c06e3b254209a688a1a0c4504f8506797abc774f7ddb6126
font_01_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 10480 bytes
SHA-256: 6025b2bbec61d11811743c261f63e777b67f48ec6767fb7a44825ced1ca50544