Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b3eb2198b14a54…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 05:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59cf963172e2bb487d85855a71c8bafd SHA-1: 04bce0c6f097de831ac60913c0479f6c3f26c94f SHA-256: 91b3eb2198b14a54f9fb818dd280919d5a63b9e386c89906039e8d7a68fe3c33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://5703n1n6999-6a55.com/contents/files/zodevovuzigokukotiwivut.pdf In PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/3073474465.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/98308792372.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/15824175622.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/fibivukopoxerero.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/24089681281.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/68803536722.pdfIn PDF document text
    • http://afro-safari.com/upload/files/mividalizipakeropofol.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/39424656076.pdfIn PDF document text
    • http://www.ezmoving.com/file/6684607700.pdfIn PDF document text
    • http://accronline.com/userfiles/file/92574018378.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37267884b---lemef.pdfIn PDF document text
    • http://tencanpowder.com/d/files/73048284156.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/wogoxoxupunanukisuwalesi.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/zusumuzojunanujede.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/boxafexapo.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokipiwusuzamivizobodafe.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/87319428126.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8qp16uj07mnpbio6d95jor9adn/60173945309.pdfIn PDF document text
    • http://altinay-law.com/images/file/44028148254.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/regep.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/26813491973.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/90023488688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=play+bed+wars+online+freePDF 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_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 17516 bytes
SHA-256: 46f4416784612559034ca6720fe0d6423c1ce4a4d9bef20bea33e596c8ad2cb7
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 10592 bytes
SHA-256: a81ba290c7bd08ff79406a714537f59a1bd183f8b824b5485291feb10e2f8ba5

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