Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19d7d8d370e94a8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 07:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ea188e3439e6dadeef1f91bd5694cb4 SHA-1: 32238a08e3923bb5aa972822145209b17c6a6a8b SHA-256: b19d7d8d370e94a89d75234ebb0845c339c4578ee8ab57ce8368a1b67b99805c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing embedded JavaScript, which is a common vector for malicious activity. Heuristics indicate a payment redirection lure, suggesting the document aims to trick users into changing payment details or initiating fraudulent transactions. The embedded JavaScript likely facilitates the redirection or download of further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://rainbowprinter.com/app/webroot/files/file/87487616828.pdf In PDF document text
    • http://wxdyzs.com/userfiles/files/vizeruzomusivuvekebun.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161344f9b497c0---wumilozan.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/rojorefetamaranotukuve.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/44764905482.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/2997861309.pdfIn PDF document text
    • http://tercovci.cz/files/file/89300334105.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/47343696784.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/8625833519.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/fizabemenedezuputamas.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/6959107052.pdfIn PDF document text
    • http://vlajamo.cz/images/file/62517332834.pdfIn PDF document text
    • http://tayles.com/uploaded/30883945491.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/19390029807.pdfIn PDF document text
    • https://durimawar.com/contents/files/11871319746.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/fobura.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/doseg.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534104d2e6---12642699639.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/80412305571.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gaxopekisijixuvijijaroj.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/zefuganupagarim.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/37652706706.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/96973699775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=transfer+texts+androidPDF 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_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 19132 bytes
SHA-256: 9739d95b25cba23d842098ef17d2d4d8f883d35e6b6a0bcc5adddcaa56f7b3d8
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 10368 bytes
SHA-256: 7b755f27a6be06b405877d0ac6f89eea8761fdc79cec10cd64c4b9a2f0de1717