Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49ca897f7212c74…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 15:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c821ae6c21903a70b11e6ce359e082f SHA-1: f2bdda9b1f697b8518bb34d14308eb060fae6199 SHA-256: a49ca897f7212c742767209164640e0b5e188ce8aa0e8348525dfe5ac10b802e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this PDF is part of a link farm designed to host malicious content on disposable domains. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://garglob.ru/uplcv?utm_term=android+use+phone+as+hotspot PDF link annotation
    • https://soudurelausiere.ca/upload/editor/file/13140851248.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/63471737567.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/viwevesemolal.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/zoratoxavo.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/suwenunevabesep.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/sivadazatix.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/79568872484.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/mifazamibakusog.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/xisiziwulatebi.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/57358801504.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/faribeg.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121220471003.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/ponutoxofukamarazodumam.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/lodotilub.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/98098780450.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cb14fab3---lepadafis.pdfIn PDF document text
    • https://auto826.com/uploads/files/garajotufusemupadodasok.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/79055664076.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/fugirove.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/lopunuxom.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/linovigofivi.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/58730289515.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/wusobojorilexeg.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/bujaxapuxumexuwozuno.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/56170964704.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/wanamejuwaze.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/tijikibigazanivet.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 10524 bytes
SHA-256: 2916187d0b3795347d7c3b8f2865e20894eeda895e7aa9ae0cdc69e8d7b93d54
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 18080 bytes
SHA-256: ed4aec2566b4fe153c602911c436f58d0f7f368ea3ea04418048832d2faadd8a
font_02_sfnt_off000130bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1