Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d29262a875b6ad7…

MALICIOUS

PDF

91.6 KB Created: 2021-09-09 23:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c21a822ad725119b3e2c71b9d4afc4e SHA-1: dd470286e9bb33719e2b0bddb49b073438a41a0f SHA-256: 4d29262a875b6ad71e0fdd42b77492e843af80e613745748f0b3173e3c9ca7b5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The presence of many unknown reputation URLs suggests a high likelihood of malicious redirection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/16666414033.pdf In PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/zuravejiruvifodag.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/fazamafofobexoxizafimosuz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/mavafitite.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/siwofop.pdfIn PDF document text
    • http://centromp.it/userfiles/files/xateliwamipiverotimewa.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5021f4b3---11010195725.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134901f5a00b---nagevopobejeruto.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/pepezuxutepabonam.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1206273443613518cfc9bd8.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/zapubepotosegazavenojapo.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/xefiwemunafaxevarusevafa.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/noxezuzawonezo.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/ragakatobasujuw.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/durumibapapu.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/28947533289.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/fusagogubo.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/12968814425.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/xafinurikuperifopopari.pdfIn PDF document text
    • http://ned.ru/uploads/files/silowasexotinekakuwemadax.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/14391236328.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/40050749859.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210902135431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=react+mui+datatablePDF 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_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 10324 bytes
SHA-256: ae9d9c7f6a81dc8b46793a8003fe0d0ac388d4adc79ebab10a1d05cb571a72fd
font_01_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 18492 bytes
SHA-256: 55aad88822493882f7558789fbd478316c484883c2ea36b7b579d2a213d19b1c