Malicious PDF — malware analysis report

Static analysis result for SHA-256 4025e7e1bdefa16d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-22 12:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43fe184f23b87bed1c03dbd827ad09d2 SHA-1: b6e70a8ecae6c426818ca93d064beb36ff6ced70 SHA-256: 4025e7e1bdefa16d39f27988a7cd5772377baf4a5b1d4980c675f1701fd36c2e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features multiple URIs, including one pointing to a raw IP address, suggesting an attempt to redirect the user to a malicious site or download. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document designed to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://praconsulgroup.ru/pict/file/90802120195.pdf In PDF document text
    • https://mchs.kz/userfiles/File/gibapatines.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/79245242006.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/bilasetisifupixawoxidu.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/24133156949.pdfIn PDF document text
    • http://bienbao.org/uploads/files/tezugififimenebof.pdfIn PDF document text
    • https://megalight.lv/uploads/files/nizulenup.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/jadikanabininidare.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/fovexewolul.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/44937047107.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/seluxigoteg.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/88964404239.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e70665443---tudijokanifuxuxolilitozuw.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210901_105657.pdfPDF link annotation
    • http://bm-shower.com/userfiles/files/57560853112.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/71552961315.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/16287106080.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/pogimijimunimakubekapil.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/85379614563.pdfIn PDF document text
    • http://vswet.ru/f/83433060062.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/betuwafexemevokezukopax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cloud+atlas+book+downloadPDF 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://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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 10368 bytes
SHA-256: 7cb6164ddda59ad7395c96d57a145ca15ec8d321b28d4b8bcda65eb6ecd420bd
font_02_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 18772 bytes
SHA-256: 160397eeee91bc8de87137aecce7372f2541a523bbb5416c0b05fbb440a52290

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