Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bba7f77d16c418…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 22:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc36e758876ac07f2c4ac540a2eb08d5 SHA-1: ceb5dfbc643d84dfe8427e909c31ff58d1db4cb4 SHA-256: e2bba7f77d16c418dbaa0ee8e32fb1e27e08261b0a76e4a8e66a9f0d2d069ddd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, presenting numerous links to external PDF files, likely as a lure for users to download further payloads. The presence of a 'download' button heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stamforgtechnologies.com/uploads/donarevevaxirixosaruze.pdf In PDF document text
    • http://www.uc-kushiro.net/images/library/File/xosuwa.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/60294214188.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/temolupoxarutanulu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135cba6a1834---kijakukujinukebosigomo.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/26847718710.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xajogegorirenexewow.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///75164911108.pdfIn PDF document text
    • https://egca.fr/userfiles/file/77619132138.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ac19e5b4dad1c9bc2ac448e4f4a22778/49814323235.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fakisenifujo.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/01/24417615973.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/20446962973.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091402472773499.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210912012719.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pubemaxejelajiw.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/45502450909.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/35790948329.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/rimozo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210908/file/16310532209704.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/29742267047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+powerdirector+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_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 19152 bytes
SHA-256: 5cb08cfeddc82d9b38bbbff89840823ee86dbfbfd9a4d08f50abd5ec8782b1b8
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 10520 bytes
SHA-256: cc2dd4ba0509cab4bd9bf7e13437bfd55480d95eec302f71a292ab5f08eea9b0

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