Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8d06131af3db19…

MALICIOUS

PDF

77.4 KB Created: 2021-09-29 02:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb3d351a24dafc4fe96be4dbf0a99b29 SHA-1: 247401b02b4e46e51f272fb488a49b4f9c887096 SHA-256: 5f8d06131af3db19a8a1e3bd894db7025b5d2836e154f544e63e45a989e8cb46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high density of external links. The PDF contains numerous URLs pointing to potentially malicious or phishing sites, suggesting an attempt to redirect the user to a compromised or malicious domain. The presence of embedded JavaScript further supports the malicious intent, likely to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=nfc+taginfo+apk PDF link annotation
    • http://www.prctech-th.com/ckfinder/userfiles/files/71505958461.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613f2295177ef.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/48695916116.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/toxipudulokoraluvegol.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210922_203426.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/logazuxupabive.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/lijofa.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/62017864985.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614735c4e626d---faropujaxezogosege.pdfIn PDF document text
    • http://chineseclothingonline.net/File/tipofewoderekatip.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/26036678678.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/basomav.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jubizowepexumuvadokejuzav.pdfIn PDF document text
    • http://dd-eng.com/files/files/49908932141.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/jijuginabiwasop.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/87646770747.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/80898898796.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/daxozokumisa.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/98329576892.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/41403341257.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d25c1339---743669263.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/44761953869.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_off0000c160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC160 21524 bytes
SHA-256: 0e3a1df5002a42ce35017e9aa98094126a7600be2f587bd98656c63f749c4ab4
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10276 bytes
SHA-256: dc34f1adba7b317bbf31f7fd3b11f5fc50520cc3375136e1efc5e3ae15bd16ee
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.