Malicious PDF — malware analysis report

Static analysis result for SHA-256 894395c631b79b4a…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 02:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2814cb7fdf1ab352c3bccd5f954c2fcd SHA-1: 80cece6c71798be88c4b77997edcd5dcff93cdc5 SHA-256: 894395c631b79b4a3755fa56864c98c50fe6408697111ef912f81c7053abbe66
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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 http://mg001.cn/upload_fck/file/2021-9-13/20210913103601424220.pdf In PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/12249570126.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/wupowudizokiguvubilix.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/77818940476.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/60293943701.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b2c2eda1---sakavisiporuroliwiral.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/8609092112.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/bebez.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/89700551203.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/xopasotujivufebinawu.pdfIn PDF document text
    • http://knipia.com/userfiles/file/94603587889.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/23027941987.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/moxizalipefikoviku.pdfIn PDF document text
    • http://sireny.net/share/files/96854410799.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/vusufesokiwowawivujedi.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/22096306960.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/ritepomeferugiguvew.pdfIn PDF document text
    • http://pbpharm.com/upload/files/ratexava.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414192ba73e---zobidobobos.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/44225040696.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bafimali.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/67256419855.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/99156782568.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/7038698920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=after+we+fell+full+movie+onlinePDF 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://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_off0000b1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D2 17056 bytes
SHA-256: b6e797eced6268ad5a5ba0b7531af829e9a771a66a716e543b6c2dca776d305e
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 10276 bytes
SHA-256: a9bfbd4eeda2c88672a367f1a78b0e643084b4ef7b8c5ad5c98f7170b7e9a550
font_02_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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