Malicious PDF — malware analysis report

Static analysis result for SHA-256 17498b27dba5e2f8…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 17:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e716a36cf68d32e2031706c474b1f720 SHA-1: a51601915029ff4c55931d48784d2ca21fba0049 SHA-256: 17498b27dba5e2f8f9a427ed2994e197569c94b30232de152ecf31ba3cf5080a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm designed to host phishing or malware content. ClamAV detection further confirms the malicious nature of the file, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ch0ua18msrkhgeqf96tiu3096o/30060301106.pdf In PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/zewamakepuxajenenodujuru.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/23962379773.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/56306460998.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/xakojedukagesojagelajaz.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/lakuvemuvemabowifud.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/saguxinibemuxa.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/60923387211.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/68579147109.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e021b7a36---95214437490.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/fepabajito.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/35052126180.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/wepamigirerinizufunamiw.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/vepagapabapugegapa.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/lamokamaretisuxuvowutej.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109011309018110.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109041119112777.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/keren.pdfIn PDF document text
    • http://apcmagon.com/userfiles/dinilu.pdfIn PDF document text
    • http://forti.in/userfiles/file/16693426181.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/fotebusagemibogu.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/kuxumigomidojabixajezuzi.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/64234827182.pdfIn PDF document text
    • http://pnalog.ru/images/file/38190203759.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/riduk.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/71176280800.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/vuxukuruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bwv+1007+segovia+pdfPDF 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_off0000ce79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 20024 bytes
SHA-256: 8208621ab5df3d859a11720fa6020bc1c34cb2569c21d9c693975cd1f9298c44
font_02_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 10752 bytes
SHA-256: 8164b5aa7cb5b8c2be985a724a93d88407a05ae38b6c5eaa3e0f4850f47b09a4