Malicious PDF — malware analysis report

Static analysis result for SHA-256 4215c05440839dd5…

MALICIOUS

PDF

92.3 KB Created: 2021-09-13 11:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 162225604551b54ddf7ac617799ef558 SHA-1: 7c7c5181e0ea9732ae3a6244da9b6d011a5fbdb5 SHA-256: 4215c05440839dd572a2745008f0c9474a30322903f2e0a0758ac024d823283d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a specific heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, as they likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=pac+man+party+royale+android+download PDF link annotation
    • https://onsale.social-push.cc/data/fckeditor/files/womozupob.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/93850248879.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/litidagazodi.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/38694629475.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109012202222225.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/sunibikunubirimimoguxomil.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/92125639041.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/dolumaxugomowefedizuzez.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/xefivuwezuzodaditiji.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/4330095474.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/46501084753.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/davanebojobokuvivisabeg.pdfIn PDF document text
    • http://kaies.net/upfiles/file/59083333262.pdfIn PDF document text
    • http://minhanh.com/files/28915924832.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/fosamodagomubudabunet.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/jozuvokubo.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/55610703006.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139be0d8ab9c---begalomunixupubif.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/85797328365.pdfIn PDF document text
    • https://kar360.com/resimler/files/93513870680.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/tobazewefozuz.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_3CFA9BF29D9E5ED9.pdfIn PDF document text
    • https://kiptep.ru/file/1775921289.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e401b56e28---naxesu.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/mamivuxifanowomibepojosev.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_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 18912 bytes
SHA-256: 4313277503536f345fa17bc63e56b5272e897487b8a88a285f2f4cc4d1101d41
font_01_sfnt_off00013248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 10708 bytes
SHA-256: f7fb610151ca7e282f4e4943e1204a603619b6f28df9a861546ea611de004d48
font_02_sfnt_off00014ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1