Malicious PDF — malware analysis report

Static analysis result for SHA-256 d115757e26bf4a17…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 02:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5b0c4f09fd3c6230ca42560e5bec325 SHA-1: 5abfcef70b7267694403a5429307af67408a32d9 SHA-256: d115757e26bf4a179349e94720eea1ccb28bcaefd1379264fec1b079e736df4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://toyotaprius-custom.com/js/upload/files/nigumogatak.pdf In PDF document text
    • http://fxmeat.com/upload/file/270f357fdb4c17ace6394ba3e744bed4.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/12678802631.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109151144466761.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/89111208877.pdfIn PDF document text
    • http://origo.ws/userfiles/file/65543385287.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0753ce24f---jetozowawedavo.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/42884414479.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911171010993996.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/75550040862.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/suximozajopoki.pdfIn PDF document text
    • https://trainova.com/userfiles/file/82386704905.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/xudamowonomen.pdfIn PDF document text
    • https://avela.md/userfiles/file/digavinugotoguwiwew.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/bilesawujikawipete.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210905_040915.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/7740551411.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/lasumebujatebovugupajiko.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/50528411199.pdfIn PDF document text
    • http://belovosushi.ru/files/gopiralogut.pdfIn PDF document text
    • http://foxadv.net/file/musax.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/dozajixexofibirizuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=implement+onclicklistener+in+kotlinPDF link annotation
    • https://b2cdemo.tickets.com/content/files/60480323015.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_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 10416 bytes
SHA-256: da3d9516dd1ddfe0cf0b9e2c3fcabb4497605e6dcf2d6bcbe232e1d26c3d2ec0
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 18068 bytes
SHA-256: 454e902f6da23f9a47f4ec5422ca26507cafa5a9ced846887585d199983fa326
font_02_sfnt_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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