Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fc9e65da1b644e…

MALICIOUS

PDF

74.0 KB Created: 2021-10-12 17:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3479b216f82e5e60a69069c70b6319eb SHA-1: 681213d012d7ed5c5668f8ed84ecc032464c3019 SHA-256: 48fc9e65da1b644e757f6dbe24d2f5d3152756808d667f42ffe96d506765e26f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness in this PDF. The document contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm hosted on potentially disposable domains. This suggests a phishing or malware distribution attempt, where the user is directed to malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0d5aca540---mitifemaw.pdf In PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/xonazafopamuruwule.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/nujimeg.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/wogozuru.pdfIn PDF document text
    • http://samtle.net/ckupload/files/sukuk.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/81171485046.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/gonawoketobudog.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cafe793ce8---99057808753.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/80871335071.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/25286726130.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/88849343007.pdfIn PDF document text
    • https://j26clean.com/upload/files/vodazimokepixob.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/wedalopezelodalo.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/22929055531.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/gilojoxitu.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/53984365262.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/guzasovopeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=take+me+to+the+moon+and+back+lyricsPDF 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_off0000bd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 10944 bytes
SHA-256: f2f03eb46ffd8d976bdf0ebe63d9bce883cc91a7fcb55b77d3db0a66e6b26169
font_02_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 17120 bytes
SHA-256: 388e32a7c981ed275fdd244e72f417a27fb73caed5ca990821f5360e64446cf2