Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e84a842f4fc1191…

MALICIOUS

PDF

74.0 KB Created: 2021-09-25 07:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 62ecc49b63bb88027f588102f824c802 SHA-1: 1d5bbedffaa9f506236c7305197a0183ba1932b7 SHA-256: 8e84a842f4fc11916c0b8cafbae444f7955700f9c2865231fe6673f8f47d9f74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or redirection attempt. The PDF structure and embedded content indicate it's designed to lead users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://jpind.pl/userfiles/file/39187063342.pdf In PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/kijefi.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/13025313029.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/bojemu.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/26273883337.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/69436949105.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109191146441087.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/fotepimudoxuxuridux.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/92589503733.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/43005647156.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/tazevopigurinofudi.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/50093244343.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/6099379175.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/mudojevidabi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8b6812f686a6e0543d7e915c69e92c11/37212455564.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/rumoxefaji.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/runiforitakikajujoz.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/22569957554.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/zarakik.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb2d5830e---fobederemugizisugag.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/vepaziwobapu.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/27557490619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tizen+vs+webos+vs+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_off0000b9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 10412 bytes
SHA-256: 23fe68218757f43df56270fc5d8a87bce6ac0a22c8f3318728b8a3c9264ae725
font_01_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 18748 bytes
SHA-256: ebbefbaddfe851d49bd1701ac4e79ddbc319935cd17143e012f2cfab4edba09a