Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf4f21c439c4284…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 10:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17df1da1c86ea05ed1efa6f5b22a5959 SHA-1: 71d1f30020b8f18834db5a933323a905332de7cd SHA-256: 7cf4f21c439c4284f3db3622e1255f1089dd3b75577ba879d4a7b75287882298
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting a phishing or credential harvesting attempt. The presence of external URIs and the ML classification strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://metabolitplus.ru/files/file/65047525764.pdf In PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/63382854833.pdfIn PDF document text
    • http://consade.com/userfiles/file/vokovakinusezed.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/16224925396.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/wezawi.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/43418785636.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630547542/files/59143089692.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/tiwidaf.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/juwebatoz.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/66357580870.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109061917058333.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/mukobiredo.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/11491626880.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/89647007632.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/gexajilipinafulefexi.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/53849086352.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/24203767875.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/memisebire.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/36908941329.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/74661801711.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/63016357131.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b6dc990ace40a9a7492240fbfc6be935/gufebuwezutafojoxoxi.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lasogitizagolagebufiwigef.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/40390941230.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/xigobulifujitikabopurubi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3ea66cc3---80847025914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=perfect+piano+appPDF 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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 19020 bytes
SHA-256: 562d6d67f99e16e214cc563c1a20e6d0fd989108e21bc844bdf58c95465e069d
font_02_sfnt_off00013306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 10260 bytes
SHA-256: 4788710f4abf700e12b861ac48795211a6c425747b99344aed1882e74b937d36