Malicious PDF — malware analysis report

Static analysis result for SHA-256 23217bff5f29ff37…

MALICIOUS

PDF

96.1 KB Created: 2021-09-17 15:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 970a5bc941dbcffc67169b2911b837b3 SHA-1: 2ed92b85a5aeecd333c1bcf292b5fd939908340f SHA-256: 23217bff5f29ff378664a4094929f41e33bedebda2a454535992667769ec1f38
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bawiwovufif.pdf In PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/26090413724.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/letemivopekawuxijiladapok.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/budozebu.pdfIn PDF document text
    • http://tion.hu/upload/file/vupimafuwali.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/sutezokejiziz.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/sizitozesel.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/wukutureg.pdfIn PDF document text
    • http://moristas.com/userfiles/files/javiw.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210903082742.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/98954331743.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/digobejid.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/folam.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/gufidelofigirogafege.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/48185095065.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/sugidafuwemuzepup.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/fedewimilonunawot.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/51110601138.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3343c605---53111778398.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff487c2538---40334981400.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/79852026883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+movies+time+apkPDF 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_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 10696 bytes
SHA-256: 414952db19aea29d62e9ccf5b96f50578049bf746231deb1774ac5107fa83f18
font_02_sfnt_off00014123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14123 19288 bytes
SHA-256: 737ccb32805405d01388721287ffe84b2dc39659a939dbd0f9eeefad5531e867

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