Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa4e4930c66f439…

MALICIOUS

PDF

63.5 KB Created: 2021-04-27 10:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f0e2aa46260e1e101c5fd6037c0afd6 SHA-1: 16f946290d1b7c6789892e36bd02ba47239f0628 SHA-256: dfa4e4930c66f439dec5a188684b9a117d60f2be41d274fcdaff680b62b84c01
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and ClamAV as malicious. It contains numerous embedded URLs, some of which are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering a malicious payload via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9611

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.blplegal.com/sites/default/files/webform/lolavojirubopikumu.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/tekuxegejarikuferibo.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/nuxikovevevugodir.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/jebumimebugamoto.pdf
    • https://ambrose.edu/sites/default/files/webform/sudelo.pdf
    • https://www.woonsocketri.org/system/temporary/webform/51053607868.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ado.net+interview+questions+for+experienced+professionals
    • https://gradfutures.princeton.edu/system/files/webform/42179508969.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/tuvoluxasivawujunaz.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/27732669772.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/76225898136.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/7842358922.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93b.bin
9c90e023cd22640e44dbf3814514aa214c8014acb84abce93c20557987178625		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 5516 bytes
font_01_sfnt_off0000dc30.bin
eeedf70f4f1da234ce0ca072a8fb9a019514717afdb4e068bac813f917da462f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 9872 bytes

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