Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8e43c0c2199722…

MALICIOUS

PDF

76.6 KB Created: 2021-10-01 20:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: beba05c2e935c106e5f62be838f62088 SHA-1: 1acbcd05ed3f1f8c4de60b05a1ac37dac453fe33 SHA-256: 4f8e43c0c2199722aef34380a5e6c2166490837afbcfcc3d64e27966e3894f59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The PDF's structure and the presence of external URIs suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=download+cleo+samp PDF link annotation
    • http://studiomistretta.com/userfiles/files/35814348137.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/nipefusorewudibegawaxeken.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/revako.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/33366418880.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210917152327.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/84772922812.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/bolizimisivubifut.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/komoluruvugasipol.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/munizelo.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/zoligadi.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/tudejetevokari.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/79962877619.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/xisesasu.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/xutevatapav.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/17600676898.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/62947145549.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/bopawararinegev.pdfIn PDF document text
    • http://taborgospelassembly.com/userfiles/file/29228902868.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/zubavesesu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/12cc4f90521099eb3c1793327c5d1d29/bobezofojezena.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/63545323945.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/27450059405.pdfIn PDF document text
    • http://sissonne.hu/editor_up/95455111034.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/fukepusison.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_off0000c09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 10472 bytes
SHA-256: 70bf0094681a3fa9469b44523c27807f6220c7dabb602b08351d86cd4c668b17
font_02_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 20068 bytes
SHA-256: 44a5dd4a5dab1eb1a0758fb633d9b502fc62d2d392574f7959faf5281de3e0da

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