Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d3f0adf77f85f5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 15:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a694a15af5582940385af9729d6f87b SHA-1: 5a5909411ef579e09829fea2fbcf084ce05b154f SHA-256: e0d3f0adf77f85f56132febfb09bcd2b2d487d2ee245a7307e01d2a55528ed72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://basisnomor.com/contents/files/gemaxo.pdf In PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/06/bexit.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/92987766649.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/safilopuvafuneno.pdfIn PDF document text
    • http://workontext.ru/media/file/zavojovinibekalafiworoga.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/95633891156.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/2343395258.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/devapakesu.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/siwugabix.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/3610264570.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xorixanupakeraxege.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/79665653407.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/wemodelaxatikerenelig.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/voduwepikekuwevarete.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/nupusasokametafazufe.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/92265643256.pdfIn PDF document text
    • http://asfalon.com/__files/file/32806471067.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/2808273331.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/63786547241.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/jogid.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210913194548_ODIyMjE0NDE4OA==.pdfIn PDF document text
    • http://fullx.net/files/86871686418.pdfIn PDF document text
    • https://marosme.ro/hirek/file/13358678607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+check+touch+in+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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 10524 bytes
SHA-256: 94d9c753bd28ff2245f06681319b6c1b494fd71149d2471ad3edb2d925fbc33d
font_01_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 16976 bytes
SHA-256: 6f498e79714e86c590ac83abbc8c4f6f970d9724ad5e3cd0bc1b60f371ebc77b

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