Malicious PDF — malware analysis report

Static analysis result for SHA-256 540e49ebc8b9deb1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 21:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0ed89cadc771dc9f71fa1de300855f9 SHA-1: 71428e0c1bbf18edaa9fbdf5210efb12f2d8d552 SHA-256: 540e49ebc8b9deb193243035ef1df8fffd50e56a0eb5dd8dc7e8883deee7b03b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://schokoladenfontaene.de/idata/20530546012.pdf In PDF document text
    • http://robwalker.net/fckupload/file/85033721685.pdfIn PDF document text
    • http://nemalipics.com/77268859466.pdfIn PDF document text
    • http://jn-zhsc.com/upload/fowikanawakakazad.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/942936489.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/tanutebaxadupusovaxape.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16148dcb9e903d---jubufavamusamenajixeko.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/8779343314.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/96673257776.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16141e66777781---xupibebugop.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/vixujokusagiwaz.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/geronulofadinogefa.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/81365770777.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/pajetaxigofes.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/29499665496.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/44669896821.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/35941807555.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/malimevusiso.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/97862408359.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/44466578835.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/55293496539.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/59732440393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=s21+ultra+photo+editorPDF 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_off0000b28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28C 18024 bytes
SHA-256: b0bbde4e24ed431cee0917792284c4e28a6028652061bd251dba85f7157947e6
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 10564 bytes
SHA-256: 5c74307bee7f4fc1a2d7a995bc38fe1187c26988c32456d283899c71ff34931c
font_02_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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