Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fe5e28a9675edd…

MALICIOUS

PDF

74.9 KB Created: 2021-09-25 09:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb8f392c2b34f0b5b0207f4c911070f3 SHA-1: 731866fb2613845a096165ec90dc3e26497c0c24 SHA-256: d1fe5e28a9675edd54cbe8a5d7ce81bd0cd031734cca7f540b387520044f5264
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external links, many pointing to PDF files on distinct domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or distributing further malware via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://nagymester.com/userfiles/file/pafinonedunodevanoxe.pdf In PDF document text
    • https://csmgh.net/pevron/www/img/file/vixomodesimoduduk.pdfIn PDF document text
    • https://limadelimon.com/images/file/90207997363.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/42583788172.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/8552012546.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/15595117328.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/xeguvaxujevezok.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/63313549295.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/dedimuroxobusapelexet.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/tunigetepevodaganexage.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/16390719016133cf710f98a.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/nejarapoxaxolipuw.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/84321653313.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/22305097929.pdfIn PDF document text
    • https://clubon.top/uploads/files/98390619747.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/38706997303.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479d550e719---kimaxoxisolesizumumakofi.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/fidabuwebexadapetusiduga.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/degifalevemeli.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0tvooevcqa93g7jijdld826m54/molasotikepisewi.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xanobimotilupovebukos.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/buzibonawijawexozebu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/forijan.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210901065813118.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/gasogepuwezatexofaxizavi.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210916055604.pdfIn PDF document text
    • http://medrea.ru/upload/files/77706178378.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210920150047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=configurer+compte+gmail+sur+tablette+androidPDF 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_off0000bdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAC 17948 bytes
SHA-256: c64b7555e5658281124f375ba3a8d574b42601b30cfcb2bc7924aa624da44c73
font_01_sfnt_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 11236 bytes
SHA-256: 740cf64dd0c048efdcc5b9c10e6c8fd8e0a29a4787a9da75a8a2edc53e497071
font_02_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1