Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e986d84b2036d4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 21:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 324398a6ca3ae4f905688b9a0f660232 SHA-1: ba60c75de070c9a6bea385fa4fffa1de5f8bbdf1 SHA-256: 93e986d84b2036d4e8bcbd5215f2a90617d651c3a41578345b2438e27cb26a78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=trevor+noah+born+a+crime+book+pdf PDF link annotation
    • http://studiophotosfashion.it/userfiles/files/doboramoruzi.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/bevijavupurukajifuxunow.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/dokefaxuwamugowitiniduf.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/xavewoxojajebujanaz.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/89863940463.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161436db32086f---61317583688.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/66399566920.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/22497013241.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/23993383243.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/jejugoso.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/merumatemepaf.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/zobotuziridizit.pdfIn PDF document text
    • https://sambelteri.com/contents/files/walaxefozasewir.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/38527182796.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/71554555355.pdfIn PDF document text
    • https://vendax.ro/files/file/99012060590.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/bizozi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1c3886f98d5d18a66004d8068d57fff4/debuxudogikosumexuzeve.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/4598400777.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/5425394867.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/jumetarirejarusesazalo.pdfIn PDF document text
    • https://panoramabyty.cz/content/87945906411.pdfIn PDF document text
    • https://fasaac.org/temp/files/87246511387.pdfIn PDF document text
    • 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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 18916 bytes
SHA-256: 29b03be8f9274116585253f2e4032b625f012bcee37a2b589e6a20db7ed1b4b6
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 10836 bytes
SHA-256: 1216e9902b6519231416e785cab817761fc0766f04d232e5f8b9ace40b5cf650
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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