Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a462a807f10b419…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 03:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e890f9a0fd434715363f94d03099d67b SHA-1: 231bcf79a13959d1bef47c166df4af6374361ed7 SHA-256: 0a462a807f10b419797424d272d8c88fb8340bce8192feae373db770e9af2b2d
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to host further malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://imad0c0.com/js/ckfinder/userfiles/files/ruwifuputizadikapexesimaw.pdf In PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/66702233890.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/domulepit.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/41654517705.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zoxojatipaxobamadijig.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613408f371cb5---walomazezevezobij.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/dubanovisafox.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/vutevokirafafegaworo.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/68434228266.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/bewijo.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/bajuxavavozibozetur.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/musixajivijimeras.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/fisapatujikubepagaxin.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/refatopijikidivami.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/denusomegilowo.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/gekitafadudemeroni.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/81424179716.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xiveje.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fuxezipegosewupolibe.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/rivuxarewebutirut.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/76665887257.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/dovodis.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/68954060811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+henry+stickmin+collectionPDF 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_off0000bfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC5 16264 bytes
SHA-256: 3350c48e2fb7d7e9caf1366bcb883f0cdea71df551585a721e1c77e57375578a
font_01_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 10504 bytes
SHA-256: 05af161250278d5e622e0de9996e0d9a87207b491e7ebc4f5ba813efb1ff51cb
font_02_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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