Malicious PDF — malware analysis report

Static analysis result for SHA-256 a047d1d24c4afe0e…

MALICIOUS

PDF

88.0 KB Created: 2021-09-13 02:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 772168a008e1d2d1048af243de3841f5 SHA-1: de3ecba0874072930ae81abca9ff2427331bb7ed SHA-256: a047d1d24c4afe0e8ef92572098d36ce1db75d39e17fad8b95fbbd11ad78dedc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF files, suggesting a multi-stage download or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://infoegrafica.com/userfiles/files/97866009590.pdf In PDF document text
    • https://ihappywash.com/uploads/files/202109102328333539.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/muludorewunipisijusowo.pdfIn PDF document text
    • http://spiregene.com/image/files/20210910_054631.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/45619630106.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/76641283152.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5cb0062456a9ee974c2b6a7b61057d15/21394073517.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/xuzedixerakivelikifagov.pdfIn PDF document text
    • https://birotex.rs/images/files/xukula.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/37635411667.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210911135508329052137.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/25126456272.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vudurowezatedefon.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/28445783033.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090814141483.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906053517275018.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lifedutele.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/51803945133.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jikojuvetijogalujebano.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/59489570108.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/kibikakaneb.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/96865568526.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/fededilofiwividorup.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/3269675340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wonder+woman+bloodlines+full+movie+onlinePDF 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_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 17800 bytes
SHA-256: 9dd9aaa93da6a3ccfd2e5854918e0c9886d013fec943ebda9300a5c7c1db4b41
font_01_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13908 10804 bytes
SHA-256: c85bec9bcf7b62b50ca1aa42f20deddc63de4f7c52267e950efc94257bcae5d2