Malicious PDF — malware analysis report

Static analysis result for SHA-256 911d388e312fc848…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 19:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ba2bdf9ed81c63398e7794a20f8a921 SHA-1: 330d37b707579d6de58168666edccfb88cec3d83 SHA-256: 911d388e312fc848aaaadd9651c682582583682d556c09ef11b1fcaad12c2dc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://manenshop.com/upload/files/36193147015.pdf In PDF document text
    • http://iberia-ex.com/images/blog/file/27545639297.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/gabojirakige.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/88620955049.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/tavila.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/12803726613.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/89304720183.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/jufavopeki.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210910152348.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/lijexoro.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/25924419149.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/zibodegujukowo.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/soluworubumu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fa603b8f339828754fd178de68d611e0/xobamudosulet.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/36013010571.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/wodakixi.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/gofukorudelizetekinepit.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241b431ae5---zotapomabilat.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/92448463820.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/29023755313.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/56677941659.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/rigapurerifuba.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/28105718361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=long+and+short+cases+in+anesthesiology+pdfPDF 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_off0000b5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCE 16768 bytes
SHA-256: e319d5edf43e6b91bc9ecbef3147cf842267e34a1f83661aadd6ba9c454f4e6e
font_02_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 10968 bytes
SHA-256: 06fa066cb3b809ad4c0cea4b8445c5227d461aa14c4ba39de05f2e76885f2974

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