Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cf2fdcfe6ab2a6…

MALICIOUS

PDF

93.2 KB Created: 2021-09-08 14:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4cd87e05de3ec6ad0dac2e62e1de8c64 SHA-1: 32663f3f571d3861fcf4b3444194fa611360a3c5 SHA-256: 13cf2fdcfe6ab2a62cf0871c5e8cb13ce36d61517be99f5dadbb13a13b9b5b5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://keralastatetailorsassociation.com/userfiles/file/46410867923.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135114911c75---giwufoduxiwados.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/segafubixeteriredakejaf.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/26400008667.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/vetev.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/74512457266.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/50021779035.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/86908763210.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/tizufe.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/zijezew.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/paboduf.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b45fc37426d39d5cafc4ab46d5291a0/pisotizo.pdfIn PDF document text
    • https://marosme.ro/hirek/file/ritevoruzoloj.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/duvasizi.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/noludubosirojozusika.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/towom.pdfIn PDF document text
    • http://gerocuki.hu/user/file/52770675318.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/83248813506.pdfIn PDF document text
    • http://gaudi.tw/upload/files/54138586232.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/88703960596.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/50055317047.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/26167048677.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/72419726327.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/77483715255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=argumentative+essay+notes+pdfPDF 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_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 11056 bytes
SHA-256: 925d9a35c92198573da713ae5e83abe19b4e95c6158c886b1bc0f8041954d6ff
font_01_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 18156 bytes
SHA-256: f7933ecae87dcd20506ff06fcc9fc57f5dbf8755ca86f62d48305d72e0df8403
font_02_sfnt_off00014f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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