Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0075399e5dc7224…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 23:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 22db9b7ee83032f8572cd81a0892c31c SHA-1: c5a9e9e9a06176d645d50448f5cd085c6e2289ea SHA-256: c0075399e5dc7224d8a5f13e7de5f99c64a5c5048d85dcaff3c56f608c4afcd6
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm on disposable hosting. The embedded URLs, such as 'https://midufefew.ru/award?keyword=current+management+of+hepatic+encephalopathy+pdf', suggest an attempt to direct users to potentially malicious content. The document body, though heavily obfuscated, contains metadata related to PDF generation, reinforcing the idea that the PDF itself is a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/award?keyword=current+management+of+hepatic+encephalopathy+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366034/normal_5ff02753a39dc.pdfIn PDF document text
    • http://montana-media.com/htc_one_m8_charging_jacka8bag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5fce8b7a8aa7f.pdfIn PDF document text
    • http://zofugef.mypressonline.com/universal_basic_income_finland.pdfIn PDF document text
    • http://zogigokilogipex.22web.org/1953640807.pdfIn PDF document text
    • http://wovemabib.iblogger.org/1687163474.pdfIn PDF document text
    • http://qrastenmap.online/89497802749fvl0m.pdfIn PDF document text
    • https://fuvenaxumegiga.weebly.com/uploads/1/3/3/9/133999500/b28e2d06ce2e92.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/xuroruzinatanu_fabokat_mebesoxegu_gixon.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/xoviduwunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_600e5461eab3c.pdfIn PDF document text
    • https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/b5969ff5.pdfIn PDF document text
    • http://koolmaxt.online/25391617394i0f7i.pdfIn PDF document text
    • https://xetibipu.weebly.com/uploads/1/3/4/5/134528590/wixanekafuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481424/normal_5ffa16a23555e.pdfIn PDF document text
    • http://idealica-italy.site/wuwekifupaxabewilokugajafnoxc.pdfIn PDF document text
    • http://bimonetejatoleb.mygamesonline.org/airfoils_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_603d0f481ac6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jerolap.rf.gd/nuveluzubas.pdfIn PDF document text
    • http://pawubiba.epizy.com/texas_code_of_judicial_conduct.pdfIn PDF document text
    • http://vawinujofupin.myartsonline.com/39323305888.pdfIn PDF document text
    • http://litutowi.epizy.com/46426107078.pdfIn PDF document text
    • http://dokaxemimagi.epizy.com/nuvijegokad.pdfIn PDF document text
    • http://vawirir.atwebpages.com/seresisinudubator.pdfIn PDF document text
    • http://saxizezubunana.rf.gd/55575965827.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 5400 bytes
SHA-256: 1f8a1cfb4cdaf3695d3dceb8051a9fff9960a635523300ce964d348e3b40ec7b
font_01_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 10188 bytes
SHA-256: 549f5bf3edc9e8786a18f2bc7b38e1df9382d855fa50f47a3c7a944ea9536dd4

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