Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff791acc468fa1a…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 10:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c6b0232c597aca09752c934079f3b0a SHA-1: 0d78724c081dc10ffa68f3500054e167496594da SHA-256: cff791acc468fa1a0398c21a8a48f3694b00f53630d26c97e6bdb59e0a5e69ea
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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 https://bloomland.com/sites/bloomland.com/files/77697749119.pdf In PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/sejiwukorefudaxubabi.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/27821509081.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5ca4ed82f---suzigikufajeferotemelo.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/66688015671.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/24416411882.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909092423328419.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/zemevakoxekeg.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/61660682329.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/tutomegivoxagamabezurilaj.pdfIn PDF document text
    • http://showpelec.com/data/file/20210901_214356_941.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/wotixuworejijozaxumi.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/kakikogazaxubadema.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/419967308.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/52593138326.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/95316534426.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/75317060394.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/96030722726.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141be7c22232---75621379203.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/13497838740.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/47267144478.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/foposevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=windows+7+original+iso+highly+compressedPDF 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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 11108 bytes
SHA-256: 830eccaff7eb074b8a5cf0b4b389b5458fd283c0c770942b2c1002713fe24395
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 18188 bytes
SHA-256: d9af146bae75b72ef6f3c863b8dffb25ea82fc26a97df2272660341e08a87847

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