Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06600fa167148da…

MALICIOUS

PDF

73.9 KB Created: 2021-09-14 11:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 594178c043e4bde7dd40d59d86fbc0ec SHA-1: 9b65b20eb6d555ca3622e747788c615762b995b4 SHA-256: b06600fa167148dac9c616e5455e8368368ff17bb22e7cb123ccd21fdc995eac
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, many pointing to disposable domains and IP addresses, consistent with a link farm designed to host phishing pages or distribute further malware. While no scripts were explicitly extracted, the PDF structure and URI patterns suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://biosystech.com/pdsFck/file/pozironu.pdf In PDF document text
    • http://purofirstli.com/userfiles/files/lomulapalumelijeguk.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/81403526982.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/41915670857.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/kigafuvide.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/zogisisitufawalikupumefod.pdfPDF link annotation
    • http://krupongs.com/images/file/gavomomatuveguba.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/dofinibesomarereb.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/xibudi.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/50jqs3jpql7s3ftlkjq8aksolm/13124843548.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/16673949017.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/90192891568.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/52940161514.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/85808924849.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/93354561252.pdfIn PDF document text
    • https://basisnomor.com/contents/files/90650416628.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/82868991823.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/gotefixubu.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/tibatakifivir.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/bizukawikizajutukixe.pdfIn PDF document text
    • http://kelvista.lt/images/files/fubokudatudasesugib.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/laposexugonemitupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=forza+horizon+mobile+no+verificationPDF 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_off0000be30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16800 bytes
SHA-256: ffb00bfd478f6ef1b04488f7aea7d5cda937c886f9159fee71b309d2d1a3a3ae
font_02_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10676 bytes
SHA-256: b7d8534ecac834c70c795a736b85945608158356682396df40b3ad55f68851ad

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