Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea87426090e133f3…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 23:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 6ed9a47f54fdb6a5823275a3a5ae9a19 SHA-1: 79380d3a330f63e61a8b97faf6aa465b4c669bc3 SHA-256: ea87426090e133f33c96755de041412532876b4e1e1e997dd807495f009327b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://energywork.pl/userfiles/file/77303412119.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c4c36e75---vemofunomogikixifap.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/xefukitojatosalomotu.pdfIn PDF document text
    • http://baove247.org/upload/files/54975905667.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/71343870256.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/70830454911.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/72900955877.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/22012830096.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/zixabaxuguzoroge.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/69764651695.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/nonujowole.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/90941629104.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xuloxoruli.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210911210202_u5ruou.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/38389780707.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/75228236733.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/67427139700.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/13502640690.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/paroses.pdfIn PDF document text
    • http://intertribo.sk/files/siturodukelirisalifo.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/bubakelevagap.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/xokovoso.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24455824988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ballentine%27s+law+dictionary+pdfPDF 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_off0000b991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB991 17520 bytes
SHA-256: ce943b7ee737cd57819fd328b900bd3bd5b40f56a6ed3188e4ff27a966bb15e1
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 10900 bytes
SHA-256: ca2f85be5dec510dc8eafdb283fe3fdfcd9fd9409439fae80b6c667a843044c9

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