Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe172786c19cdcd…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 20:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9fcc960e19495d231955a2deca8f5916 SHA-1: 5bd1893adee5bf7e3d78cecbf0a8b211258fee3a SHA-256: 9fe172786c19cdcd6a9f52544987ec186f2604c7d48e89d09c2191e9d7fe268f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. The authoring application 'wkhtmltopdf' is often used to generate PDFs from web content, which aligns with the link farm behavior.

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://medvor.ru/uplcv?utm_term=transparent+weather+app PDF link annotation
    • http://www.saito-ken.jp/userdata/file/suropapulujoterujavabi.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/jawuroja.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/97573210376.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/38307727530.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/29194525678.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/wuvuxizapejilulefovuxel.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/92406185238.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/sufib.pdfIn PDF document text
    • https://panoramabyty.cz/content/17017832987.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/88967471688.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29f30f634---duwesepenejan.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210912055947.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/40575903511.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/54028473342.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/99572508340.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/nivapafugisameninopale.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/11175164121.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f70751df3---zefenarewuriposun.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/xegabed.pdfIn PDF document text
    • http://sunway.me/uploads/file/132322407401.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/ninigorop.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_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10140 bytes
SHA-256: b2759662be0ff0802bf5a35d220314d6600b9fddfeab0b52bb758f570667c082
font_02_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 17868 bytes
SHA-256: 80f4d201c912e6de4afe1c01d94b761c97e7ae0b6c1bf1d0f3da508d823c8dc7

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