Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece0fd5f0bb8b3e1…

MALICIOUS

PDF

89.3 KB Created: 2021-09-17 15:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44e13ba84e9e29da2a8bb841b834708d SHA-1: 178ea78f33149bf56576e8eafa7a5a2789b9643d SHA-256: ece0fd5f0bb8b3e10c0a74efd7c7bfa1920ad826948284e99e69e6aaefe2d993
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct hosts. The presence of multiple unknown reputation URLs suggests a redirection mechanism designed to lead users to malicious content, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://4darchitecture.org/img/all/75389684847.pdf In PDF document text
    • https://greenboo.vn/uploads/files/61357085333.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/20971349611.pdfIn PDF document text
    • https://e-midas.ro/files/file/74381948143.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/23764656644.pdfIn PDF document text
    • http://steinemann-ag.ru/gevejilaligatorekipinilum.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/41081816362.pdfIn PDF document text
    • http://strahyi.ru/images/file/kewabedu.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/zibijenofukefubij.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/555190075.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/ninedim.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/tojojepak.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/33106951911.pdfIn PDF document text
    • http://dytac.hk/userfiles/buwimaravaviwugeginorep.pdfIn PDF document text
    • https://clickbox.ro/images/file/27901131057.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/98333979649.pdfIn PDF document text
    • https://equinox-e.com/upload/files/fizasigezijazuzibisitima.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/hqe1njp49tjbuuuav9mj4hplpm/tizilimufesibafapibopor.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/gunomeligonoru.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613843cc4e727---fovubopukew.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/5169575813.pdfIn PDF document text
    • http://khocabien.com/uploads/files/27335706046.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/gelowategatawitomipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=station+of+the+cross+guide+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_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 18100 bytes
SHA-256: 81d85c59f9d8422e2de8db605fb0283525ef14459277b743786dc25590f73bf9
font_01_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 11028 bytes
SHA-256: ad5dc13df0d2d9b28c664aa8feeb62e76444a5bd6f5df181e56855a1231ec674
font_02_sfnt_off00013fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1