Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd10b9c5fab7b07…

MALICIOUS

PDF

69.2 KB Created: 2021-10-12 13:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 841bb402892c4a9380681daf5c1dc803 SHA-1: efa8f93aabc356f6f30b2918e3ae08fd181f3781 SHA-256: 0bd10b9c5fab7b079f53d178ad8bf83907db11c86c691a59a69df8e1b132ea6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=clive+staples+lewis+narnia PDF link annotation
    • http://wumag.pl/userfiles/file/tikalepetiwanugud.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/56714132433.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/relogivadar.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/14477932274.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/wagupuxitawugataf.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/vabasejufotezi.pdfIn PDF document text
    • http://mlsite.gewoozee.tw/custom/file/lifuso.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/65358962462.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/84779299656.pdfIn PDF document text
    • https://olterus.org/contents/files/nibutuzujulivusiwifanamer.pdfIn PDF document text
    • https://soechi.id/userfiles/file/99344618488.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/96994823009.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/2090953062.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/87089df76b0e8510463e1f36095a7dfc/pufolumitofuwelexod.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/85868724107.pdfIn PDF document text
    • http://gmt-tw.com/app/webroot/userfiles/files/nikelareraxidamigepusa.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/saxuborigar.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/sadirotupikupun.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/73376711231.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d78913dfae---91525685959.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/wonebivaluzoraxadorase.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/fososajenewikenipa.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/85359422276.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_off0000afba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 15612 bytes
SHA-256: 6fcd54401a147f1ff2ee19d99781268c2a2ecc6d5f5f08c23b806de8d6a6c45a
font_02_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 10308 bytes
SHA-256: ed9220d3dfa0c3dab1b567adc3a91e2e1f890e3b57695c5771e3bd9efddb861b

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