Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9aa28927c4c8b3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 14:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9382e777ff1d9ce43a192730c74265a4 SHA-1: fc4d1413807c2218491b5ed7fc3635d387637275 SHA-256: ec9aa28927c4c8b30cc5faaf2f521d350cdc9f64d787d3ccea494de137b3a983
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links to potentially disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely to lure users to phishing or malware sites. Although no scripts were explicitly extracted, the structure and URL distribution point towards a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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
  • 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://romovi.net/sgi_userfiles/userfiles/files/zemibenalowufuja.pdf In PDF document text
    • http://metabolitplus.ru/files/file/kazataboponazulajiti.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/pobibalawojinati.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/reponosenisufatusoji.pdfIn PDF document text
    • https://tckontrola.hr/files/57265647585.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/juzejegimugu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dopusuxa.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/74413128223.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/29195522080.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/2933468557.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161364bdb98163---bolagataruz.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/pukufipelako.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/numuvubisogofogosuma.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/61802830744.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/mipimuwoxovom.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/67165527164.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/59895705851.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/61747534948.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/dojezito.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905084405.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/rovomineguxekuse.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/65374953055.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/68315214862.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/wafebebapuzakajopaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ethiopian+labour+proclamation+2019+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_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 11272 bytes
SHA-256: 8c8031be0a5bd22d2e331fe9429b23c25d5e4fd7262d9d0d7e35066c84552ab6
font_02_sfnt_off00010cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 17424 bytes
SHA-256: 252df1f19cbc74c4db18dcdf8b3ab8f9aa4dc3c4cab666514349cbcf77ec63c2