Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e1017b2d39f415…

MALICIOUS

PDF

94.3 KB Created: 2021-09-18 20:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 144db58638e2d79fbcf7af1abf59d35c SHA-1: 296ca30de8cbcfd0a094238fd38cf4236ba17f9c SHA-256: 28e1017b2d39f4154602312131e762ebb24b234c9fe88b6506034fbcb0bd3dd0
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with high-severity heuristics indicating it's a lure for command execution and a password-protected archive handoff. The document body is unreadable, but the presence of multiple unknown URLs suggests it is part of a phishing or credential harvesting campaign. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION findings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://headlinesdinerla.com/uploads/files/11538095783.pdf In PDF document text
    • http://stensoproject.com/userfiles/files/83254843023.pdfIn PDF document text
    • https://istanajp2.com/contents/files/46894885813.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161451bf179d36---7853827329.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/bipolofokedubate.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/32324161726.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109171728156504.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/vudamoxozasagerat.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/18962706497.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/79781173734.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/6917959353.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/88856035092.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210908_233726.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/78780106739.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/92915451026.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/giretuxobabadexusagix.pdfIn PDF document text
    • http://podarox.ru/public/files/tenitogerurutoveken.pdfIn PDF document text
    • https://phr4u.com/files/sozawuvonopovuduv.pdfIn PDF document text
    • https://profesa.net/userFilesfile/kikokafamegudawito.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/20057892897.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/16341144320.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/51599391892.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/92019996542.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/gisukedewagazixunet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=twrp+recovery+img+file+downloadPDF 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_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 17452 bytes
SHA-256: 6384eb6dda846e906fec400e016db94b8b9f7916096559c4059f6847e99629a1
font_01_sfnt_off00013a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A01 10924 bytes
SHA-256: 29ebaf9620dcab887a4003190b831c97d016d774053b8c6359e520584d30a673
font_02_sfnt_off00015323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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