Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e907976f08df5b7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 11:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c480919bd05ec2653764f4d4c225afea SHA-1: 0e0118db1b93e9ed543245ffaa226cc98c6026f1 SHA-256: 4e907976f08df5b73afbaefa5c9f0ebbc4124a3c9fb0830b424a5264828ab397
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=does+resetting+your+phone+remove+viruses PDF link annotation
    • https://handientu.vn/userfiles/file/93384554726.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/bufosodisoxeg.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f267cb6681---jidisudagar.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/nulumugupunogavipar.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/90555013997.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/vagibexisoponalojekowol.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/vogev.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/51896995384.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/79354513026.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/654b0ac2efe73c402bdf0686728b041b/dasebodopabiwosedaxes.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/79312278704.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/62415891558.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/4855459369.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/texurididategedefesesepim.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/27036786282.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sonepaxawigop.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/dufukujurap.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/92195233696.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/dajiluxo.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/tepup.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/73575735399.pdfIn PDF document text
    • https://hoavily.com/uploads/files/81948014465.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/88017511022.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/zazukixixixadig.pdfIn PDF document text
    • http://sartor.ru/upload/files/getotemubuxokosokiwo.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/47197920415.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_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 17388 bytes
SHA-256: 9b53df73712fadf595b6b1da96743db8f5e638292695e35ca705bee56fdb8fc6
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 10772 bytes
SHA-256: ca5b31e929366ace02a0e8bf3534b34c3c511d52ba93bb86e6427dcf6a24cc26