Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaefd94924eb475…

MALICIOUS

PDF

65.3 KB Created: 2021-04-12 05:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efa3b05b63cb1d62672cf502c4fd367f SHA-1: 474f6ea9340183ecd736424000c28ed6d1488ada SHA-256: 1aaefd94924eb475b9c970aa2e01b5fc6124ad17bb6f2b3c3588d2bb9f4bd110
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable domains and are presented as a "Starfinder core rulebook download" lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9695

Heuristics 4

  • 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
  • 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://klm3fg.grhosting.cz/sites/default/files/webform/files/nuzutigurazuleziwuta.pdf
    • https://web.liderpapel.com/sites/default/files/webform/53484808665.pdf
    • https://ambrose.edu/sites/default/files/webform/zabufenopi.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/taxevoxasubosiwugudabi.pdf
    • https://www.blplegal.com/sites/default/files/webform/80507347088.pdf
    • https://www.dgs-interparts.be/sites/default/files/64751185730.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/68138040624.pdf
    • https://www.jsif.org/sites/default/files/webform/moridiwivomepagaduso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=starfinder+core+rulebook+download
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/76225898136.pdf
    • https://gradfutures.princeton.edu/system/files/webform/25860956451.pdf
    • https://lib.asu.edu/system/files/webform/sikukuditizituxabisezopel.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/95830943344.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/45540448673.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/50075528518.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77b.bin
086acade119f0d17fd18f43fe93b293e9ea12e51e7186c3caebb5caccd10d2e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 5236 bytes

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