Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a737f1c172f753b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 12:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b97328b1410e63ccd9e6b8fb4e3af084 SHA-1: 7c1e5cad7051e8c4ba573a48d7960ab0a9cd027a SHA-256: 5a737f1c172f753b1403dcd7af02cee24f3b1daa7300a53878263c48408a4101
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://griesvoegwerken.nl/UserFiles/file/21129491826.pdf In PDF document text
    • https://ganport.pl/userfiles/file/72035825801.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/wikajeruvixal.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/julob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367b53b4d66---noranujilavowigavitelixo.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/27116805425.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/27383970876.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/rudazuxiga.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/65224763821.pdfIn PDF document text
    • https://armenia4d.com/contents/files/sikabadereniri.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/8306739833.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/gexexezi.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/49077068778.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/zifoxoviwisixemepif.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/pudetuxa.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/26974482525.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f423071c61---lobofosanezimil.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/81004831598.pdfIn PDF document text
    • http://arsvet.ru/img/upload/2364807104.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/xadepulikujobunosedot.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210907_B4B26044D64361F1.pdfIn PDF document text
    • http://esistore.be/userfiles/file/94733011839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=beautiful+words+beginning+with+ePDF 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_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 18692 bytes
SHA-256: 0c0fa3467683c85e8741bdcebcfa030af5271f3dbaf64c5130cd742fde659bf4
font_01_sfnt_off00011547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 11012 bytes
SHA-256: 4052e6a3f6d903107edcf0bae65ac6d772ecf08b42f3c64138013bf078f81d96
font_02_sfnt_off00012eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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