Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a4443ac4b0d9b6…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 20:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af1e7a52678dcaf1e856925ddea0525d SHA-1: 96eef8126e7c6543322988f4ca3df72a07226802 SHA-256: 14a4443ac4b0d9b68aab97faab98d5c9e1309de8843bb81c9eb31e01492d3e10
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious execution. It also features a high number of external URIs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://studiotecnicolari.it/userfiles/files/96882153991.pdf In PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/rokipalanubutopoka.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/rominilinetamidoxaluka.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/3874421133.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2c37b07d---57501170661.pdfIn PDF document text
    • http://belovosushi.ru/files/89272002595.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/rewifiviwimapoteba.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/75050028504.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/vefojufowar.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/pidilivuvuxusojibo.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/jusefojavan.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/73328255442.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/remexu.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/lopefefixeker.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/pagudikezoxudafikotem.pdfIn PDF document text
    • http://topflexsports.com/uploads/30312468026.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/41427113753.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/roluzususuviwo.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/34012322756.pdfIn PDF document text
    • https://clinicscrm.com/img/files/33725066045.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/kiwevoxupi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb9e8155a---letajesikijo.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/fesot.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/71547505172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=margaret+persona+4+guidePDF 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_off0000b83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 16144 bytes
SHA-256: 6577ed8e1e40d3a3b391af1d8f6cd93e66cd7b64786b25d9b228d00fae50a0f4
font_02_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 10692 bytes
SHA-256: 7de57c07c6a01b4049d3008de7a4b2e5c357c35c92f25865f4c2a0004efabf36

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