Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e4e2c23489e6b4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 17:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7f3bd444dddd6aa1a7dd3f064fa6cd2 SHA-1: 4b0d1aececf103b4d7afca05f58bca4c4ede3b79 SHA-256: 09e4e2c23489e6b4b6bc619df056cea653c547da5ad418410eda2b06f6d09ce0
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 phishing or trojan-like behavior. It contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9117

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 http://benedictinoselrosal.org/ckfinder/userfiles/files/vepajiju.pdf In PDF document text
    • http://ymjgolf.com/file_media/file_image/file/94884528424.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161454cc1698e3---99103284573.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/7718686327.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/44955939826.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/vesibedetujarujujutuwulax.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/17238157303.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/10087136822.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/mafezobakisilam.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/wukonakop.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/tedotekagevenowuzif.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/86315453776.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/xutaxo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f53b16ac---90066409877.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/nuvejo.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/bexutapupoma.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14237837272.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/satodawovoreti.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nojuwelagajagetifom.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/436658283.pdfIn PDF document text
    • https://digireg.it/upload/furasopiwevuletot.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/sizagotutilimebilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=new+vidmate+app+download+2020PDF link annotation
    • 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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 10656 bytes
SHA-256: dd30c56fb94ad925e95cf31a4505224f0f27a289e9e84ef4be3504da44c99ef2
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 17488 bytes
SHA-256: 0533be88bac9dfa4c1088e1751e6722a29eea30c067d5a6f74241bff58f1add0
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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