Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1be4d1f794a60c7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 15:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 293938ca99a6890d8c1339222da6c116 SHA-1: 85cba6a683f7d05a5003f2dd67b77be2795e26a3 SHA-256: b1be4d1f794a60c7710aa70b5b3e17bbcdb4ea4f55d066f7c68f46ddf60b35a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to deliver malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ciiinnovationsummit.com/ci/userfiles/files/10686476338.pdf In PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/44064412287.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/33573685763.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vusumodewejugivi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613454a1b811a---70266397258.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/45626291536.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/8657706374.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/50135864984.pdfIn PDF document text
    • https://vzglavniki.net/data/file/9666932227.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/tojigo.pdfIn PDF document text
    • https://kultmotor.hu/images/files/63210790526.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/33733862012.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344ee24dc9f---wirola.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/30525127890.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/040451012223.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/96121990351.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/2831001759.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/57015036340.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/61247689910.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/14458657286.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/64857096051.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/14665031013.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/luzamexilidilefom.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xatodebisefofotakax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=change+device+id+without+rootPDF 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://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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 10716 bytes
SHA-256: 0516da2e5997ffc47d608230f35e8383f087d461fff371c20774dc4ae2d42ae1
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 19400 bytes
SHA-256: ab072d2a5df548cd187eb7e4f542d621801b8ca6d484c49ad30ae90fb063e900
font_02_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1