Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9315c1599ad0de…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 04:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcb61a8c2abb08259f05b4eeffa20ed9 SHA-1: fc6de17e0b55fbd2e7b6ef541f3d50f4a77031a6 SHA-256: 2b9315c1599ad0de2c60e042c63a4e5a0afdee6858a408363f6880cdb063a3ef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and link farm structure suggest the file is designed to redirect users to malicious sites or download further payloads, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://neodentpetrosino.it/userfiles/files/82412362709.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/zelizidibibuvexowetub.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/tubapuf.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/nifobawunexamonitoko.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/64152921158.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/kunipuvaveruworexuwekobin.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/45285697237.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/xuvexezodutozubopusum.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/virinesituputabifir.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f45f3c3bc---zujagazofonuj.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/gadekolimodine.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/71469870189.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/47304747434.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gisamuropelufuvivowax.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/koxobusirazaguwemazuxakem.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/detimuxadaximozu.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/17769531352.pdfIn PDF document text
    • http://rayanchem.com/d/files/72515154249.pdfIn PDF document text
    • http://bwc.lt/i/97391303415.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/sewefigidapotelina.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagelopuzuwebidarit.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/44246229776.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/vuzuxobenupifopilikog.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/77687757734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=who+wants+to+be+a+millionaire+apk+sonyPDF 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_off0000b852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB852 10940 bytes
SHA-256: f102c7d64fc81807d4dfcfff336262f5a5a302c3ab77bb93dc710b2965ba9c80
font_01_sfnt_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 17744 bytes
SHA-256: 22e1dc74fba6751b6f2274e4a3113b2949ba43b12779adb8b86d6b1d0c62c1e9