Malicious PDF — malware analysis report

Static analysis result for SHA-256 9101377397f7a1bc…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 09:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 972b50c5629bbcfd4d36b7f8ff83932d SHA-1: a357ea29b92a971ac9c8c526513e4b835a8912a6 SHA-256: 9101377397f7a1bc64ecfb5804c20721c411e9cb47060942917cbca81b1c6548
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links, likely directing users to malicious sites. While no scripts were extracted, the structure and URL patterns suggest an attempt to exploit users by directing them to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://peiitw.com/Upload/ckeditor/files/91677064878.pdf In PDF document text
    • https://togelunited4d.com/contents/files/fexojubam.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/5103683040.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/jijopususurojumagutejo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cb46e8bd1c94eaad0a8587a25cb477d1/jobefanojorikepasuvoji.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/bedidujilefuwevizoz.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/poxatod.pdfIn PDF document text
    • http://geose.ru/userfiles/file/78318169701.pdfIn PDF document text
    • http://guchen.ru/d/files/57382329380.pdfIn PDF document text
    • http://4bx.pl/public/file/76441558724.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16134db179f8e4---55016400294.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/zuzenesekizosugawi.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45958661481.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/42675773863.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/dogirujosiwida.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/pudarokujaxudofo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/88621864083.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/nititi.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/18329131395.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/lokakakif.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/vunedejelolujipola.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/93008593515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=abrir+archivos+aspx+en+androidPDF 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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 18020 bytes
SHA-256: 8ed71365141839afa57ee9e54fded0a80f650b49ff14ea04f8c21f51a897bd3e
font_01_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 10756 bytes
SHA-256: 412eb49ca620d58e01cb0dca120dbd60716ecde0f1f2930b3342112bac602817
font_02_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1