Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbfe769696a048f…

MALICIOUS

PDF

86.3 KB Created: 2021-06-10 02:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 590868d1273700024bdeda77b8e69077 SHA-1: f463ca5051639f73ae57c423ed125112d26f74c5 SHA-256: 0dbfe769696a048f06d34d51dd60682569c91431f26e88a7a97f8793c98f7d4a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://botokaw.ru/123?utm_term=neonatal+cmv+treatment+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378618/normal_6036804b07d8f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4475853/normal_60b2a5b183de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_606a96e5b511d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425533/normal_5fd17089df4a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_5fcd658a5167d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460725/normal_5feb620068b88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5fec76a157f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_606004a1942aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_6069e79362934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_5fe080c1dd4f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144477024/descargar_mods_tboi_afterbirth_plus_pirata.pdfIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/144801735/histologia_geneser_3_edicion_descargar.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/38022335179.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144766347/how_to_link_two_sheets_in_same_workbook.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144514059/jibokawezado.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/jesus_you_love_me_too_much_free_mp3_download.pdfIn PDF document text
    • http://risodige.pbworks.com/w/file/fetch/144926403/pradhan_mantri_ashraya_yojana_online_application.pdfIn PDF document text
    • http://nukisefel.pbworks.com/f/26311677076.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/f/lazuzuxemazevezululokafa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 5172 bytes
SHA-256: 0b2b88fb3420e302b52816ac7107f6a67e529bd2b20d169d7b807c86b4733165
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 10908 bytes
SHA-256: c360fad76ae892578b780e603230194d8b866eeb9a770c3a3fc92b6710ba3e24
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648
font_03_sfnt_off00013d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3