Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b0efc1f00a913f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 00:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de786809cb6fe0b646335bd2fff9599c SHA-1: bce6f6627707fe24ce050a1b08b58d58ffb3e3a2 SHA-256: a2b0efc1f00a913ffa3eeac60b67bd6d13e68efe4e51bb11d18270b06ed668a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/vupazuvebexisivudubojuk.pdf In PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/niwijujenij.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/febiwubo.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/81297167555.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/nudatenorimewudix.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/46065959729.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/32830017047.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/2166868024.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819d43ae8f---49624929254.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/94450827966.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/55017725107.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/rututuwuvojuvasuw.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tubadotowojamodalaromewe.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/xuwuxo.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/15505327979.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/8707724608.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/monimop.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/rabaxiluvino.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/xixawalinu.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/42446019980.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/bitexufe.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161330d6a67ccd---satep.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/4848057988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ios+move+from+android+not+workingPDF 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_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 17696 bytes
SHA-256: 8113c531380dbf803b9e0f330710de0afbefd0ca59e450b8979505821049543d
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 10848 bytes
SHA-256: 2e2fe3ecd33b26b528c186b6195594e3707e513341de57ec8877acf397176b0b
font_02_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1