Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b14a6e200ef572…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 23:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 620f37bbbc24fedd0554bb56e7909ddb SHA-1: aa4df2dc1b4e39f209faabbd865875cb4d1216b4 SHA-256: 81b14a6e200ef57252c7bb28bcc23be42e67b534967835420c56acad36f4c757
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://garglob.ru/uplcv?utm_term=like+a+boss+full+movie+online+free PDF link annotation
    • https://konyaalotaksi.com/userfiles/file/lewodipisojonironatoso.pdfIn PDF document text
    • http://reopen911.info/media/file/7063977577.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/73552183214.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/67961094021.pdfIn PDF document text
    • https://pmms-online.com/assets/file/jojaw.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/79930296271.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/64297857415.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/13658332906.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/70082579676.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xiverizenewajetapo.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/mudekewosasalijunopevar.pdfIn PDF document text
    • http://emannsltd.com/userfiles/62130983882.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/xesoxoruxadupuxiremeke.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/mosanexasizonunov.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/22157848603.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/rarejudivesev.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/90059549576.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/butomebogozanize.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_1581A631861E1D93.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/510716668.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/99153164042.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/42086598615.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gosoxosawininifiboxid.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/pikufewal.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbee0858d---56297373945.pdfIn PDF document text
    • http://candientushinko.com/images/file/56957640274.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 10632 bytes
SHA-256: 2c4dc7ff68f73ed033ef8ed245e5c40138c1d22af1dfe907b413dffbe05e1c57
font_01_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 17188 bytes
SHA-256: 5ee45f8301fa981391f139119f75044c6ae02ddc336da9b9aadf0f7e6135276c
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1