Malicious PDF — malware analysis report

Static analysis result for SHA-256 67813744780b39e0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 13:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecad17b15c9c6ee2f90ad9303867f8e1 SHA-1: 37e52b5db673cacc558d6606b8c726527653f509 SHA-256: 67813744780b39e00b900fba63f39a4200c9c9fb9af03f3a37e8ad418a1b589b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common technique to obscure malicious destinations or distribute phishing lures. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://www.santabriganti.org/admin/ckfinder/userfiles/files/silexuwilofox.pdf In PDF document text
    • http://jingluo.net/uploadfiles/files/liwinotokop.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/nagevo.pdfIn PDF document text
    • https://davnosti.ru/upload/76615295967.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/pivekatatibexuki.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/12063849458.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/dumobuvena.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/jodukafezunetegukug.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/46692032778.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202191445243000.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/gizadazubevavugupar.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/47709348379.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/sebejewunuwawetigug.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/fonuxixonuzemuwovexiripa.pdfIn PDF document text
    • https://zzwgjx.com/d/files/dojadejun.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/4456837283.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161419fc0a3a45---15861542046.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawaralusetaboxiroxu.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/defigurix.pdfIn PDF document text
    • http://state-lithium.com/upload/files/zofirixorefidebago.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27b8c732d---rudakolemowi.pdfIn PDF document text
    • http://podushka.by/files/files/82458849613.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/gimaralupinorobasofaril.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/47527312045.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109072106353808.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/75603001529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=book+week+2021+themePDF 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_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 18212 bytes
SHA-256: 2b1047825778126986dad822c79c1b37ac24f682fb704753e587e3756fb85f2b
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 10224 bytes
SHA-256: 79f71151a6f9dc8a8a8b4c5fb9e46225021315f9d7ed479bad31f9ab400bc7af
font_02_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1