Malicious PDF — malware analysis report

Static analysis result for SHA-256 4650a34897379e81…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 20:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 038d042c73b52ea67ff5db3c19120a03 SHA-1: 8bc654dafe5cafdc21cec5940d8ebeec534056eb SHA-256: 4650a34897379e813d709600b44b2940980255cd2eafd64102340ee0873e2f87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=gold+body+weight PDF link annotation
    • http://se-ty.ru/uploads/userfiles/file/xagedizusolawobev.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/duzozifureka.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/68461439711.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/gigunaxemoz.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/56227176782.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/15147748380.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///60877241358.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/46682250852.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/26361728384.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/29141683314.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/32466559456.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/68149664107.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210906203013.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dizexu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057a54acc2---juxujelexididavukaja.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/libubukidowurikukutif.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/86173026177.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/lumijenilusawupekoda.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/mibazebejuwurugujevusuxis.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/93791949129.pdfIn PDF document text
    • http://metallpress.info/files/12597540648.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/42442714781.pdfIn PDF document text
    • http://yljinbiao.com/admin/upFile/2021-10/file/33806766130.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/lirazojajinosarixef.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/16237208286.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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 10372 bytes
SHA-256: 4a63e81a69befa83955ceecd6cef61e318e7639f57b1dd34e5f472d6df0b1fea
font_01_sfnt_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 16180 bytes
SHA-256: 2fc8d1b3d412608fd1fb5c020f6243fd38aba2134064caacb5d14dea17063ed5

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