Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ca9518d4daee5c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 16:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c00112bc9bcaf27e6d827fc19f2d778 SHA-1: 2a5464f299090fb532a0c21ff8cf4d6de5e93d25 SHA-256: e5ca9518d4daee5c0d1dfa2352b50a9ef0a332e603c95bd6715b2a3ccefa0347
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to lure users into revealing sensitive information. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery attempt. The embedded JavaScript likely facilitates the exfiltration or redirection of user-provided recovery secrets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://solturism.ro/images/file/51475822745.pdf In PDF document text
    • https://samajsutra.com/userfiles/files/54116282489.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/naxotadezi.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/1962944500.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/43019922630.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/pozepifabibenorolaxuk.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a56bafd54---23047182260.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/vevemetex.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/rukogozufinurugupikufa.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/78334963727.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/fexinewe.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/29479419372.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/xokak.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/wipalikumatevexi.pdfIn PDF document text
    • https://yifff.se/userfiles/file/kilukupufo.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/filifaparonulafub.pdfIn PDF document text
    • http://wawa757.com/uploads/files/sajugezezexejigotuwi.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/58875914609.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/mobovejumopupenijalaget.pdfIn PDF document text
    • http://precisao.net/files/files/37190328948.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/jilaxuxelezeralo.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/genoli.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/sesapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kode+rahasia+samsung+s3+miniPDF 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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 17988 bytes
SHA-256: ad41f9dea1eaa9dfdba8bdb67248586846c46bdefc85977b4225b55d85c6a0ba
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 10816 bytes
SHA-256: 5accdf88f840dc0b3424b5e1f604c5ea78534f682ce621f83d2de0acfdfedb59
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1