Malicious PDF — malware analysis report

Static analysis result for SHA-256 8473bdba1cf0b72e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 23:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 00a3aded18887f17bf1e8ff1292d44bf SHA-1: b086a087ffb89613d5ae49fe4db5f0527d013d92 SHA-256: 8473bdba1cf0b72e66ca32361822a391f7716670f9f8fcd2254b39e39d7ffffc
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is structured as a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. The presence of multiple PDF_URI heuristics and the overall structure suggest this document is designed to facilitate the distribution of malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://huntic.ru/uplcv?utm_term=zenui+launcher+old+version PDF link annotation
    • http://standdominica.org/files/files/63546598174.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b44911523540ba8d92d2a46534c0d5cb/32835855490.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/37786886372.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/musulabofanomipadozam.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/18402306698.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/59202357272.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/gufopevigam.pdfIn PDF document text
    • https://edgecs.com/documents/83380385033.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/59996642674.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pegoxupatikukizibudefom.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/6579257626.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210921012022_uuo5h1.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/43294643705.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/delogimekeratep.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/76370997385.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/ligusaburakigixe.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/xeviduseguximuvafon.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/72027445180.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/54366817815.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/jofegupakarebipuvuvog.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/lirare.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/92843442364.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/28239690656.pdfIn PDF document text
    • 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_off0000ad60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD60 15544 bytes
SHA-256: 75dac49bc236eb40ec3037177dedbf3418fd04c6462fb3a19ab8a30223f75481
font_01_sfnt_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 10500 bytes
SHA-256: 831abcb513c891d2dbb34c14655bb5d5cdb0dc79d36e9743456199f5bf35ef70
font_02_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1