Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3146c52a546e60…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 22:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b2ef577d58001b210e8e2b5c3180f73 SHA-1: 37c74b831fc9903b8a3c0fc91f171029c274a9c4 SHA-256: af3146c52a546e60b9546adeb380df083697a3347ca79399dd23a977d135a3c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs. The ClamAV detection and ML classifier further confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thecountryclub32055.com/userimages/kepopedetajore.pdf In PDF document text
    • http://dianacb.cz/userfiles/file/lugubu.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/12823396831.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/8801705364.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/29222853020.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/fakuraf.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6ddbe978---kagejokosoj.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/pabaxinomameta.pdfIn PDF document text
    • http://packturf.fr/files/29559912121.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/xomogoviviwepekolowo.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/xefivamubolajelati.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/wififadakador.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/90368801798.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/xajogesaziluguratabufijij.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/51173811152.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/18629421273.pdfIn PDF document text
    • https://777mto.org/contents/files/modazovevurijomidideg.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jekanegipumimafupamamisip.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/tegav.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/xopapabusukefani.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/76969127117.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/3580660349.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/nivomizojipabi.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/kobosij.pdfIn PDF document text
    • http://surestegc.org/documentos/file/xedubimod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+make+my+android+charge+fasterPDF 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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 11160 bytes
SHA-256: d1eb46a089ecbc56577f4c5012b697feea42a3a948ec310c2591bf8cdba6640e
font_02_sfnt_off0001125e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 18160 bytes
SHA-256: 94ac7b52a285383265550f96bd4f4eccf2ba740ceb44b73ffaa7614501bd9a36