Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaa5af4ff29770e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 05:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c2531b211993dbc88f3f38f12fcf106 SHA-1: 779615b2225c81bcadbc687f324716edabdb983c SHA-256: 8aaa5af4ff29770e05699576b3cc9ecea5e7a6cade2836717ad8b41734028a4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, indicative of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. While no scripts were directly extracted, the ML classifier and ClamAV detection confirm the malicious nature, likely through exploitation of PDF vulnerabilities or by hosting malicious content on the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://cructi.ru/uplcv?utm_term=android+schedule+reboot PDF link annotation
    • https://bosingels.nl/ckfinder/userfiles/files/18470433067.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/26029000140.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/95682002665.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/zizadoxem.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/10078650520.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/50346623486.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/xapewim.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/jumudiv.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/39459932740.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/9795931756.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/78404016526.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/zuzisonexonixi.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090508362445.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/46960464443.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/jozebeku.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae8d7bac0---kazewanowitedanaxeniwesu.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/zemolotolusejenifodag.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/jarixetanafujukenavedodov.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/36558696300.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/peridiwodarejatuwezol.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/ketefevuwutosamunavis.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/safozevunofij.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/96884785782.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_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 17784 bytes
SHA-256: 33a0519b91cf2b9a7418f11dd58b0261718cc3a73fb5e233e150d25300f0a922
font_02_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 10528 bytes
SHA-256: 1448c137c5aa90d2af7f4f72cb49008e8c6153bee06d333e534c213bf4c50202

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