Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6294c30e1ebbdd…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 20:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c6628ef63d48e80c2c422aaf51f1b104 SHA-1: cd40325a9bdc8858b06774dbeb4753cf2454cdf9 SHA-256: 5a6294c30e1ebbdd88554f2b7715825964bb6ded93d7a955936caa49627f7f21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=swann+security+camera+dvr-4575+manual PDF link annotation
    • http://speckletrack.com/update/editor/file/95513456197.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/397351651.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vulakekovima.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/711127313.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/70166067976.pdfIn PDF document text
    • http://shophouse.info/images/files/95234192295.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/29532397468.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/elpjgi087ah8bkg6t3a3enl5j2/78002097064.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/jusiwun.pdfIn PDF document text
    • http://lulanjina.net/upload/files/zetorudajimumubogotuvokid.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/83173871335.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/dijowogobal.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/520015604.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-6/20210906080527648153.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/25733401494.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/31591704819.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35739896237.pdfIn PDF document text
    • http://popmetre.com/news/files/54933876904.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/37654750535.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/41513059234.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/kopovimewazizedorapanifi.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/tirakuwosuzaguxotuf.pdfIn PDF document text
    • https://aokman-drive.com/d/files/dulosokozaruwuziraka.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/27750188532.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/10927058122.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/1476432643.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_off0000c878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 17380 bytes
SHA-256: 24434353ffd29de165667fe56842399e5a4334c50d1501f307d3c560f86f59fc
font_02_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 11148 bytes
SHA-256: 20f14babb9111e2f09aa6841ae2fe778383f78e0b2eef56207081c27017081f6