Malicious PDF — malware analysis report

Static analysis result for SHA-256 577aef550823d34a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 20:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a229e3a7df55a23c9e7e9f809d070708 SHA-1: e2baf617cdce2868b60a6183393915df6c993cad SHA-256: 577aef550823d34a65a0efcff9c5703d8c3f38cd8234c67d889f3578b26afeab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=mod+apk+gunship+battle+helicopter+3d PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148ca20da2b5---68339606701.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/20585012894.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/binokofa.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109191820156593.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/nudaditorik.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/12100218491.pdfIn PDF document text
    • https://xaydungkienthiet.com/upload/files/703594841.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/gowaxanuzutokigenolubige.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/kozuj.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/96717457578.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/rikobanalajajosixuvewe.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/19986485783.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/zumoruwazegopajapugalum.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/84916801910.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/kalijewonepetazo.pdfIn PDF document text
    • https://siroyensao.com/upload/files/nogamanizapu.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/zavobamag.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/tiruvalugawujudo.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d12518e7c55851e834bffe0325d1763d/66286796229.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///32063407958.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/7919413963.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gikovade.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/24133580884.pdfIn PDF document text
    • http://fteq.ru/files/file/36094327868.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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 16876 bytes
SHA-256: c17ef7b7aa31dd2152f3825ad6e4b61270637af33ae135a80c275121b395b8c4
font_02_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 11288 bytes
SHA-256: 9a97acd55492c18914e230051b8f4b10d6d375125bb3a2b511aaebddd4440a8c

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