Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67946cee36d4f5b…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 17:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b85850de396636b4677c10d1e1bdde2d SHA-1: 7f5ef030d43467e837737743afec5feac4d0e06d SHA-256: f67946cee36d4f5b2f8d6fb83b6b092c264baeff9a201f7753caee7c195eacec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded JavaScript and multiple external URIs, indicating it is designed to exploit vulnerabilities or deliver malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pegasomeeting.medcoast.net/ckfinder/userfiles/files/jorufa.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1c3179fd---59624096596.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_AFA93BAFB4D76A8C.pdfIn PDF document text
    • http://praguetransfer.com/files/file/34627513297.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/13761832541.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/29269659406.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141f25251289---bazaluloliwen.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/pulanarinowegasusor.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/wuruwelolo.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/47560727505.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/16030795013.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/ruxogu.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/putasuvojuvuxodosipu.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/jejubofusedaxup.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/30923384476.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/nawifemuzokim.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/84049618295.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/91484780430.pdfIn PDF document text
    • http://irths.com/upload_files/files/sunomeduxukux.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/mitapovor.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/86177984972.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/delenu.pdfIn PDF document text
    • http://blccy.com/userfiles/files/xakiwotowabitudegigekezat.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/tobujirivarorovuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pandian+stores+latestPDF 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_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 18520 bytes
SHA-256: 6bf90d4a907d843b618701133a525ec54a818afa2ba8335a1ac02a9700aac512
font_01_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 10240 bytes
SHA-256: 7068d818cd23def46bf0a32d4335bdee973aca92ee2c80d84f63c359f150cd1f
font_02_sfnt_off00013a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1