Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff4a5e9dd13b9b7…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 05:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6477e8ba56e407d2c6f8b60d6e5a611 SHA-1: 2a0afd1c309bdc0eb48d018d536a980eecb87840 SHA-256: 2ff4a5e9dd13b9b71bca569b69985411333e98506fbfd627a49b08e1f1f7f239
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The document contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, likely designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://basyapiemlak.com/yukleme_klasoru/userfiles/file/82093597448.pdf In PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/37976004754.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/83590400034.pdfIn PDF document text
    • https://wineart.online/userfiles/file/15060945297.pdfIn PDF document text
    • http://gewald.ru/content/Files/85783072551.pdfIn PDF document text
    • http://praguetransfer.com/files/file/jakepuveg.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/jasuvixofalotebuv.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/54844087954.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/xokulizukubo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a4730cb1d9dd560bdf68290d3edcc091/ketisox.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631146116.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/47635605573.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/34541328422.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109021222042257.pdfIn PDF document text
    • https://udruga-invalida.hr/files/nonavigonovalusugipava.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/83939589474.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/mumaxidijoz.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/lufikojito.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/56778477102.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/luxirijenofexiwen.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/mavipegulofagejepi.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/zapofuzegusetukisuviviga.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c56b92f5b22e57b9eca16ed6e9af8d20/1154254188.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/64508457502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=random+apple+gift+card+generatorPDF 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_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10840 bytes
SHA-256: 918f9bf7c2de89e356a202bf9074dc0dc6fefcff2737db0a2e7b6300f52ba09e
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 17896 bytes
SHA-256: d77649f2681bb539430cc7a824a9ddf4fb1ae82f2820145aa0930d22bf39f0d3
font_02_sfnt_off000133f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1