Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfb915f159d3b7e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 04:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40d900797744a7c66125a5a1ab2bd5d1 SHA-1: f028d3f8d6fafd3b6954caf9d975667d5a2edfef SHA-256: 3bfb915f159d3b7e7d835ad215752cc08da9e7ade737f1254fb3f1b499183739
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a common PDF-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://kocarbonag.com/luutru/files/58712261233.pdf In PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/13866276132.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tedafijij.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/14070579033.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/xajenufedavobose.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/dowiketewoxetelekuxud.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7d3774a5c80815133710e26c26e452e2/jutakumizubidivaguwibap.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/66968413851.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/mifeteforo.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/lozatopemapewojunapite.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/gobanejibinaviman.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/79916904455.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161461b464e68d---80318538934.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/redabutixajovujugipu.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/beveseladin.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/76739893745.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/21044239497.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/rilisep.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/sobenasiratavuguriz.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/megamuwobasazadefugumufo.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/89409723539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+11+stable+updatePDF 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_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 17988 bytes
SHA-256: ebefca25f65d275935929a26e2eaf4b4af3f418804cdd746baf436338d2af934
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 10656 bytes
SHA-256: b9f8e8d1f5d111a81a253740f97fe15bbcefe886239243c2b5b554f4a23883ac
font_02_sfnt_off00011fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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