Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2052bf43f35568…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 22:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aec632da014782c7a99b2834149e1b6a SHA-1: 91c06390f066055ad3b291001de711e0dd0a7d08 SHA-256: fe2052bf43f35568250a864aafca04f676685a682db07fa745133e1680c060a6
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URIs, many of which point to other PDF files hosted on potentially disposable domains or IP addresses. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary purpose is to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the overall structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/79553985666.pdf In PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vusavuxoxepizibidijijo.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/68736256351.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/wofurevavomefevero.pdfPDF link annotation
    • https://www.iieng.org/editor/ckfinder/userfiles/files/joxozozenalavajibubusalo.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b1c4a81a---67160314762.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/76020499512.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/51916485729.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/wobagevejafadivaxo.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/zekagodapepes.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/76243479953.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/73350154630.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/bekatem.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/bavam.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/95679714822.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/14517617350.pdfIn PDF document text
    • https://badoza.net/userfiles/file/65702179097.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/movevubogedonunukavijo.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/68007837799.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/33793291710.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/9337473262.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/34527929964.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/kozarivoliwikapud.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/devopuwivunikelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vishnumaya+sahasranamam+lyricsPDF 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_off0000b2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 16280 bytes
SHA-256: 1e88803c8e2f57f53371c1b52da5459dc0af706522b85fd2875ee4d3c5933124
font_02_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10328 bytes
SHA-256: 611224b5dc887f96cfa0e6568746c3252f716cda050fc9611957e5e71d7534bc