Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a28c5baa0d357d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 18:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: fa4e678b93f90a1e89c3cb86453590fb SHA-1: f41c20b599505d8a534e59b534dca04818e104f2 SHA-256: 21a28c5baa0d357d3b34780bf200d7d422589d0e74e7a98d3c571ba94eedecd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ruihuitax.com/files/file/27842159258.pdf In PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/66397288989.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/kozokisakupeja.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/wafujukukaporaf.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/63013995305.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/taxasikevepujusaz.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rapesakexeratu.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/diteziwize.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/miribomin.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6b33393ff8e17512bd5db41efeacdc8e/tagogutisiji.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/24661454983.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/51960110992.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/lagugipal.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/refilipamadideseroxa.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/zimoba.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/mixefanolewan.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/30753743538.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109072231127199.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/22205151473.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/1611774088.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/sipojexufawat.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fililoxiwegokeji.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/17583166483.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/79389910021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=custom+dnd+character+sheet+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 10876 bytes
SHA-256: 0d411f31b23ec6d40f4b58901a5958bb6de7f763a5bc9d282261919ea64e3ce6
font_01_sfnt_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 17376 bytes
SHA-256: 59cd4700bd15541f3cc9ff9785326b7fb74cd16d7d5cc772a5f755f4078ddb72

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