Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b49663e3ce832e…

MALICIOUS

PDF

81.6 KB Created: 2021-10-14 04:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 658d8bcfc45f232047f2c85eae8014af SHA-1: 3b6dc5cae68d9803bd43e82ad2cc30dcc88586ce SHA-256: 59b49663e3ce832ee03faa9ca0f6af5d972e8c64c4aa8bb3788bbc0b2df97d14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cmoretv.com/userfiles/jebelopexapesanamifa.pdf In PDF document text
    • http://oguraclutch.cn/uploadfile/files/patezuwomawetatofuwodoxe.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/32274550501.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/51326826073.pdfIn PDF document text
    • http://vaynhe.com/upload/files/ziworerolotuxera.pdfIn PDF document text
    • http://101balkon.ru/upload/files/81587871028.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/39171027720.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/70877943707.pdfIn PDF document text
    • http://shosholoza.de/file/dodurideleraliravapazeluv.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3cd581ddf0e98d6822769b69027633c3/62296579704.pdfIn PDF document text
    • https://branches.armz.ru/media/File/masizivekiguforujegomikob.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/mezelag.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/nepuludizosozur.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/torakamesapofinibenusoba.pdfIn PDF document text
    • https://dm288.com/slicice/file/87833502789.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/xepewidif.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/82646592391.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/97129066052.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/zuvirategugadav.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/luvugavenuwi.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/73830094832.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=what+is+the+appendicular+skeleton+composed+ofPDF 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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 11072 bytes
SHA-256: 7a6a52790318a2d3bc40d58a02066d37ce98ecd7ea800ddcc1bde6cef9edae0f
font_02_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 17192 bytes
SHA-256: f015d72285b07329cb0af8f81a80662d4cbd516c5bf507fdecc6fca731278510

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