Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d82e153cbe46b5…

MALICIOUS

PDF

75.9 KB Created: 2021-04-15 14:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c417432fcfd7550b710675bef54f19b6 SHA-1: 80ce27b15b5b192e637c5b215adf1684a58845db SHA-256: a8d82e153cbe46b58ed49a9118ae8072de15a912fe53918524730d4472d29fac
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of numerous external links, many hosted on potentially disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.dgs-interparts.be/sites/default/files/41094691834.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/bidepe.pdf
    • https://ambrose.edu/sites/default/files/webform/talizovub.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/66890294103.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/64296936159.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/bekam.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/17232120942.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/vewamilobofesiwukor.pdf
    • https://aboss.by/sites/default/files/webform/pibodanagulevegomenet.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/39809543560.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/bulurifabisiwotubavigivos.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/72246142748.pdf
    • https://ambrose.edu/sites/default/files/webform/11118021720.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=app+to+turn+photo+into+avatar
    • https://printandmail.princeton.edu/system/files/webform/68272747422.pdf
    • https://gradfutures.princeton.edu/system/files/webform/buviboxakutovovujigobimis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede4.bin
09eff7aeeb25f015ac914163d8bdf8aa7ec43456077003ae774523174a0234d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 4744 bytes
font_01_sfnt_off0000fe06.bin
5185b8ea4dcf03c255dbd3489647736797ee49e298a56ef9c3a8e318e80bb083		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10840 bytes

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