Malicious PDF — malware analysis report

Static analysis result for SHA-256 546f548394bdfc53…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 13:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77f566a9dc68449729fae3a18f1d0201 SHA-1: a6beb2a031bfd90d237326edc14b35a8b6f648aa SHA-256: 546f548394bdfc53e002a21932f3251a347bec51ee903734c40fd524d3c5f29a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0f78ad70---3909277573.pdf In PDF document text
    • http://yingtailong.com/upload/file/210910143335099716m6e1hzo3097r.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/22541325560.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/79832671375.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/32551693324.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/pivebu.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/71224398073.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/gigofozatalerurulafox.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/roxutalogo.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/numumadoxomiv.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/kakixo.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/kepamim.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/wijamadosafuzavol.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/vusozaz.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/wugodudemexabebijubejobev.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/65193701647.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/sokamexip.pdfIn PDF document text
    • https://digireg.sk/upload/27752959658.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/59165237119.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/vekobunifexona.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/bexanisusasemakadu.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/80090220595.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/lavavesozosedadapi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/611h4ahsf5t6albuagm1lpn1mj/6630911886.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/59969648041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=handbook+house+kurita+pdfPDF 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_off0000d77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 10872 bytes
SHA-256: b012991feb270728e19482dc777f9f2fef936cb0303cdcbd2bb409707da0d77c
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 18072 bytes
SHA-256: 1cf72db0f1a46e981bbc31e74a99fcab2276588dbd0276aac7a69b458e926d0b
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1