Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b512cd50e7035b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 16:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a0e8c3cbd6746f797c592136309d8552 SHA-1: a111acb5eafcf9c21fc291e64faa92fce93f7837 SHA-256: e6b512cd50e7035b0333cd7454a7e48bfeb81beeac9ad0c8abc1eac79fba6a0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded links, many pointing to unknown or potentially disposable domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f09ec469---71353122721.pdf In PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/ribolox.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/wexujatenigenezojo.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/balifilowazeji.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/78177659002.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/wewegetoxuga.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/kumujijatagolo.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/69768447651.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/27444957979.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///roful.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210905110829.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/36469467358.pdfIn PDF document text
    • http://tfforming.ru/d/files/19285195922.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/98340353793.pdfIn PDF document text
    • http://soc-in.com/data/media/files/50631385447.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/bogixanibakowefuwosedus.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/31669591285.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/71134295045.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/rijazakigudoveji.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/82382244305.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/86996156990.pdfIn PDF document text
    • http://bankerz.in/qpic/files/rufalozutijok.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/bea251bd92884ec7a2464cf49ee90e7e/98486794439.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/7177078389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=quran+pro+mod+apkPDF 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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 21224 bytes
SHA-256: 3dea0544c17f0654331a43c024af9818171583c1a92916319cea4abc28bc7015
font_02_sfnt_off000128da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 10268 bytes
SHA-256: c691fcf0b3a56b8dc5e7b4d9c9dfda5a6f3debb67242033151f245a968472e8b