Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7f733b742f17e4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 18:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 239a4909ef83101dca578e1a75699207 SHA-1: 1e898bb55776c8b3f01cd79cb577f541368cae03 SHA-256: 1c7f733b742f17e4e0a723fa2e331ef1349e8de83c84c175bca01b128d415baf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with a high confidence score. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters, strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://pixomot.ru/uplcv?utm_term=hunter+thompson+pdf PDF link annotation
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/dabunolunuroxuxepisivipa.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/nuwaveked.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/luzejekuxolez.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/17201638483.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cssn1ociehq2s2lahg5gh30u23/gamuduw.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/pewovow.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/nukolasarizonum.pdfIn PDF document text
    • http://synfarm.com/upload/files/vagubiditenus.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/73594475007.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/49804065371.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/89045960547.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/37884171713.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/negavofodexewedoza.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/vubexajazonasupo.pdfIn PDF document text
    • http://live-net.it/file/wenowiwalodinelegizalugaj.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/49975704510.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/bumejiwudixamexageleri.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/70130764797.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2b87032c82c9155a249e8f42b2a5b832/40940591622.pdfIn PDF document text
    • https://hobbypet.cz/files/file/18278635461.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/kevena.pdfIn PDF document text
    • http://punaide.com/userfiles/files/wusadezemomafeluz.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/kosono.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/buxaxewabotufirudi.pdfIn PDF document text
    • http://koala-al.com/d/files/gozafaf.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tivajozazavukobulabatakof.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/vuvutulidiwigojegete.pdfIn PDF document text
    • 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_off0000bbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 16196 bytes
SHA-256: 82155d5386420c425b67e6b8212b71d20049a300f9f5e1bba79ab2e660d368d0
font_02_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10552 bytes
SHA-256: 5af774f7acc2f8e8f70b38b02bba3993794661410038f3de111851abe63ef88f