Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc02f4d9a2fa9df7…

MALICIOUS

PDF

96.7 KB Created: 2021-09-14 10:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0415336761757ecf69f28121d0b363d SHA-1: d618e88176ad315a660a4b4f7cab3272c693acaa SHA-256: bc02f4d9a2fa9df78d38df78065467a5e3ff698141c75d1509b515af3884a114
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The PDF structure and heuristic firings indicate it is designed to redirect users to external content, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://nhahangthanghuong.com/uploads/files/82420934553.pdf In PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/43727790578.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0de8a47eb6d70545d5791cc03d86ec92/34406123888.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/raruwu.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/31673632043.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/tugezuzuwijojiw.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/ninokukusekuxexexudafox.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zawitesusepopuzonovujiz.pdfIn PDF document text
    • http://aven.su/userfiles/file/kitek.pdfIn PDF document text
    • http://sissonne.hu/editor_up/wezakizen.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/67272941281.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vunoriwu.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/zumaniwufipawuzirerofo.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202194147587907.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/12264638394.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/84992921460.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136cce4b7676---46683881241.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/jasinenoxaluzowa.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/2728242136.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/7212981337.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/19495875050.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/84771541315.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/84987867867.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/601937064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chart+of+electronic+configurationPDF 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_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 18448 bytes
SHA-256: f6c4048a8d523e4a7a3aa57433ae4d80e4e22ff4e9f64294a9de24c2a851240b
font_01_sfnt_off00014490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA7 10580 bytes
SHA-256: bbe0ff6fd0500a357fc34e948acfb9d62ff94ec6cc36ffee2da6fa06955fda80

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