Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11fbe29d948f2b1…

MALICIOUS

PDF

73.0 KB Created: 2021-10-04 23:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0aba5e16bcd8b0a0c71d9ce1c6e7900d SHA-1: eb664d3aa470644498932bea56663fd76b66cd46 SHA-256: b11fbe29d948f2b1cc06b75028ea03f81f4c148bad9cb5b0a8486c5622871e93
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=rack+of+ribs+recipe+grill PDF link annotation
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/57657737083.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/bozodewulakusepimese.pdfIn PDF document text
    • http://gibisch.biz/files/files/puzitikidawilokoza.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/76272077990.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/zutabijobamukotizeg.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/14132207013.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/72463457783.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/rowutopunararuzemenozade.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614472d39ab54---dabafug.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/16643747686.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/77164828196.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/monazakanexagobarut.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598ed8713d---29919824692.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913002928064.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20211004024512.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/rexini.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/gapikidep.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/57641468838.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/kaguwigemuvowezutud.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/54228792573.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/44230538224.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/62148388180.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/89251115302.pdfIn PDF document text
    • 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_off0000ba41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA41 10732 bytes
SHA-256: da08b1aa9328df87343b9ff9ae0a1db704ff2d04128ba3dc78b22558404f296f
font_01_sfnt_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 17376 bytes
SHA-256: 52c9945b4bcd2cd8cc3ca5dbe0ea09d9d839845b27106a2999c64d210a41e29e
font_02_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1