Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ee70f564de9a03…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 08:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7afbdc52daacb64a288bf25bdc2c38a3 SHA-1: 5cc7d05bce5919495dd90134399e974c0dded5eb SHA-256: 05ee70f564de9a034827123836962f86393d7aebbed9d45187e93bb1477367e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=gta+5+graphics+in+gta+san+andreas PDF link annotation
    • http://bjhtdszdh.com/v15/Upload/file/20219152234324666.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/34801421396.pdfIn PDF document text
    • https://peterdegendt.be/file/bowumabedozonido.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e881e302d6---kurinijub.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780a430c68---loduwozagobisowimekifefi.pdfIn PDF document text
    • http://pactolous.hu/upload/file/nekagowaworiz.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/24168368414.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/woxagib.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/wofugamiritomov.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/79937495314.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/dijifeburobuwogepanukoti.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/92118232468.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/31615498604.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/22082516469.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fadovetukudorase.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kunevukepisofagekodi.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/jovikaxifax.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/47533446049.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/sosipidavuv.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/60232480608.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/kenonenavifixot.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/difubizib.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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 17688 bytes
SHA-256: 2e6093dc558212b60734f09e55ecb979eb58e3b7fb51f47eed90a012a85e5f3e
font_02_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 10800 bytes
SHA-256: ece5ee65354384f26f5a5361d6e6d7edc3d6959e41a954c54c1728a88e7414f1

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