Malicious PDF — malware analysis report

Static analysis result for SHA-256 d294d1929799d036…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 02:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08ce0ef2168cb61fec782c08779f421c SHA-1: 0f9e772406cf0acf8bf35d142b989f590cf9f235 SHA-256: d294d1929799d036ee03612d8a92cd7134a539663ade20acb4aacce0576d4583
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=use+pc+apps+on+android PDF link annotation
    • http://tbff-bygg.se/img/files/fuviju.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381b2df264b---152752933.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bavisuletarozezuxowak.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/53450127696.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/filaxon.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/90507922053.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/mowevukofodosidizasi.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/64794814607.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/74439310656.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/mipubewimawopuvukosun.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/mapiwawezedexotupamelede.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/wipukibof.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-17/20210917061727449930.pdfIn PDF document text
    • http://hongdacable.com/d/files/70725501253.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/jizigosugo.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/ruton.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/pivogupuxijaseki.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/98088755330.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/14967557445.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/43217377743.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/86388336570.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/22653014059.pdfIn PDF document text
    • http://dezis.ru/uploads/files/lepane.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/diroxawun.pdfIn PDF document text
    • http://cl-pub.com/files/files/76857969181.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364c046017f---82991982093.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jabanukexosavurejel.pdfIn PDF document text
    • http://mega.kz/media/upload/files/91304896897.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_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 10368 bytes
SHA-256: 5dce856b0a0c61667e933178cece66edcdc5444b38b5bcb63255d962145bdf36
font_01_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 17180 bytes
SHA-256: 910e4b8805139a82dfbcf574db76b21ebe61877dc6458cbb4faf8ad47d570624
font_02_sfnt_off000133e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1