Malicious PDF — malware analysis report

Static analysis result for SHA-256 0709f10fd1180545…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 00:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6935da27fb92cb88bc5dbe8d4e0baa9 SHA-1: c5bfdd6c6f417c97549b101bcf259f373fee72de SHA-256: 0709f10fd11805456ca3fb8a65c65c999ddc16b844d028bc344081d6e6620ac1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a link farm or redirection mechanism designed to obscure the final malicious destination.

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 https://europawindow.com/app/webroot/img/main_content/files/vatotukag.pdf In PDF document text
    • http://101-games.ru/images/uploads/files/33004913819.pdfIn PDF document text
    • http://biomehl.com/images/content/files/kelevexor.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/bejewepurixotij.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/gekabufexijaroguraji.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/15730992071.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/xetekafadiz.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kaluze.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/57609776514.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210921050726.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/wipisulobexeto.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/808489606.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/4910584201.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/24484209929.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/2724439343.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/9203917497.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/17363634328.pdfIn PDF document text
    • https://gangnampools.com/contents/files/95016704408.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3e045d2378bbbdef8b97070cb7044f27/wiwusofukixonunonumoz.pdfIn PDF document text
    • http://kalbaninc.com/userfiles/file/pavukabedunoxakovaso.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/91190402308.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/681533936.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/60362990929.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/98573837038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ps+cc+android+apkPDF 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_off0000bc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8B 10324 bytes
SHA-256: 36c15f6f100a616f8a41f7f47131e07fb05756b4f07f9f536d7c20e2e45aafc4
font_01_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 17128 bytes
SHA-256: b91562f9dfe1b9a70213c16c21d1653dbd129b9be91b3750bd3cdba760d897ea