Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7c9e715eb158ae…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 07:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 020b4f76c96dbbaa966fe7f3071257a8 SHA-1: b2ca7848268e0ddc20166feb0c09c0619d48529f SHA-256: 7a7c9e715eb158aed696b09fcb930f42cb21770473f14b134413a63f942ac922
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded JS points to T1059.007, and the nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=es+file+explorer+apk+full PDF link annotation
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/tebeju.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/40435153046.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/68903035113.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/rekozuf.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/bavodarevis.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/kotaginaburogi.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/75333595923.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/82773249825.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/luzeluwud.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/44126227428.pdfIn PDF document text
    • http://parentini.it/userfiles/files/virasaluluwavejufuvuro.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/74257547738.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89048461652.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903131554782.pdfIn PDF document text
    • https://dm288.com/slicice/file/fuxubip.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/jotedigikedovuti.pdfIn PDF document text
    • https://edex.co/userfiles/files/89720408281.pdfIn PDF document text
    • https://masukpt2.com/contents/files/javiziz.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/nogekadata.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/91816079757.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d345fa3650cc2e32681e2f3942c0ae27/zamaragowidosazodatekuko.pdfIn PDF document text
    • http://101balkon.ru/upload/files/38249236723.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/67330248525.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/jemexijaf.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2qdnrlblbj6rj4cbdj4lg623i0/tixonedimimikap.pdfIn PDF document text
    • 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_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 21552 bytes
SHA-256: 271cf57bd104b0f3151459e5e2b97b7dfad99b1189a946dc5edd6850e53da363
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 10424 bytes
SHA-256: de45baaf3b7233b3cf2c20fe552bb051074b41cfd437a01144eef3545b8c63b6