Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7d828bb7238d79…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 02:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: eac333a23bf1a34dbf8a5760bd018bf8 SHA-1: 83c6b288539a18a9dd753e0ab995696e7135b749 SHA-256: 4a7d828bb7238d79404d95c3f5114a8433fad41ab1c1cd8a9d4dbf005354271a
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 SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

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://myblindz.com/fck_user_files/file/vobudodawik.pdf In PDF document text
    • http://zamel2.pl/userfiles/file/56689401188.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/lurediwojopojinuxe.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109091138003248.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/62373566903.pdfIn PDF document text
    • https://thehouseproduction.net/file/pozativodufelumujibume.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/falefopidupen.pdfIn PDF document text
    • http://abnicum.ru/files/file/47806501254.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/xidegopub.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/31569914388.pdfIn PDF document text
    • https://buyafranchise.org/files/files/24666804542.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/26645085542.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/65091932966.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/88248687233.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/88514912083.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/salupe.pdfIn PDF document text
    • https://stopserv.ru/files/file/40885970654.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/rexewijakew.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/77180676583.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/8445689968.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/42522393513.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/bidiwi.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/zijobasa.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/41135807498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=checker+cc+generatorPDF 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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 10324 bytes
SHA-256: 15e9970e9602a812905111a43556309a7cb414e82dc26b00ad14dc9adcb5b04f
font_01_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 18584 bytes
SHA-256: 99af45ecfd6b212177974fb280bb7f4c0e1da93e04baf5bebdfa1f2a5337eccd
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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