Malicious PDF — malware analysis report

Static analysis result for SHA-256 9023c3b27f606859…

MALICIOUS

PDF

82.4 KB Created: 2021-10-12 13:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5bb61eb5ac1cff725573d6ab36379bae SHA-1: 606cc9bfaae54056c011f79b9e0aa42487cfa941 SHA-256: 9023c3b27f606859ca1765eb89a6ebd11ea83a6e1dc906a81bcfba3328b67dc4
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains or are part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript, although not directly executable in this context, points to potential malicious scripting capabilities within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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 https://myclubowners.travelenvogue.com/userfiles/files/5536808482.pdf In PDF document text
    • http://ke-sen.com/userfiles/file/1633321521.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/wukisetavafa.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/gazudut.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sijisizuluvorobej.pdfIn PDF document text
    • https://talaa-obour.net/webmisr/uploadwebmisr/file/mavubazunarurika.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/33240784480.pdfIn PDF document text
    • http://mimpishio2.com/contents/files/panuz.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/jegutoxukotef.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/dugasoferajofe.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/73086077037.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/surugofu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/wododekojivikuromasuzuj.pdfIn PDF document text
    • http://salt17.com/userfiles/files/32652479390.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109070644056919.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132696a2838d---81039220236.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/guxadebososox.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/gobimukefotikupedawapij.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/kuwezelesosutapir.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/xobubewonunopike.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/90034441656.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/nikeruxuwofimokil.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=finger+throbbing+pain+after+cutPDF 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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 10760 bytes
SHA-256: 7a108403cb3fc2e30c1523b76455acfdf25752f0fa058bf663b1ea0525df32d0
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 18344 bytes
SHA-256: db7a3444c339bd38618d93e42852bdb713d6c8859c015b88e6902145e5d013c1
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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