Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba35201404382236…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 09:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e9a2594a4593445fa795aca90c2d0d4 SHA-1: f1ed3c28d12751573e52e5a6a0743a5ad73987b8 SHA-256: ba352014043822365d217df4cf091cd544040e9e57d4b313ce30a8a2509052e2
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, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDFs, suggesting a multi-stage attack or a phishing campaign. The primary purpose appears to be directing users to a network of potentially malicious sites.

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://jr-bang.com/uploadfiles/20210908021610.pdf In PDF document text
    • http://stfurnimart.com/file_media/file_image/file/51377508501.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/luxegotilujedawediwiri.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/gaxoxojogotimajani.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/ligodemuv.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/womakenarunijefugegara.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/rogejurepe.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109081253086749.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/rikazotebizemugolejorami.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_004911.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/54741158430.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/48025608504.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/9058636367.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/14964685964.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613170001ca09---6457797799.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/pituzevaris.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/walof.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/66866815744.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/sawukufojibuv.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/45550576495.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/ralenojivuf.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/konemesurovidabexejizum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cheat+gta+mobilePDF 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_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 17144 bytes
SHA-256: c369c016e439b5d8f2f3bae255eb85382729e7611fc5e8cac4d21d051e29c5f9
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 10352 bytes
SHA-256: 2c694c8f37ab0b8e92272758cc2e458105bc2dd2c0b910be36705b980fb5d895

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