Malicious PDF — malware analysis report

Static analysis result for SHA-256 7592b8181a15db88…

MALICIOUS

PDF

78.0 KB Created: 2021-10-26 12:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40d42bb54bde5a5cdeb9e3f9d4d5db36 SHA-1: ed5ce8b31dfdce3287c7074fa0db8d3700c9d9de SHA-256: 7592b8181a15db8875c78a271eea7752f8f6023426c7f30e17cee131a452d58f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure the true malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sandipkumardutta.com/ckfinder/userfiles/files/62393421684.pdf In PDF document text
    • http://eia-edu.com/userfiles/file/43682849455.pdfIn PDF document text
    • https://baongochoa.com/upload/file/bofumeke.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/wituwesovi.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/dabizaritutekalamefezine.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/75409364763.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910150603.pdfIn PDF document text
    • http://mobiliteit.nu/files/xurerulul.pdfIn PDF document text
    • http://redactron.com/userfiles/file/wamoxezajupon.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/zijatejexopiwurirow.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/76297771087.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/96839402093.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/41883719747.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/65288009387.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/gikaluxemelane.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/4188831520.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/votugogedifaxeludi.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/zimokudesukop.pdfIn PDF document text
    • https://roundtable106trust.org/admin/uploads/file/jejobox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=baby+length+percentile+calculatorPDF 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_off0000cbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 17692 bytes
SHA-256: 173343cdaccdaead94b8dfd298e23753a5bbba25ec61cd850bc1413eb9a49afc
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 10892 bytes
SHA-256: b667ecd514dd2dc66622038d68bd9c8ab6ec7ce1890d116e8cad76bd06a9adcc

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