Malicious PDF — malware analysis report

Static analysis result for SHA-256 1063f9953a5d9e86…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 03:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7120c29675c363494b83ee244ec8cb55 SHA-1: a4600a05816540647be5038d104ed041a4946171 SHA-256: 1063f9953a5d9e863badf92c60832b15d15b48d9aa32d2db4aaeaff133352db8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external URIs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=android_winusb+inf+download PDF link annotation
    • https://alihuata.com/userfiles/file/15818588464.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/sabusekijotuzadadu.pdfIn PDF document text
    • http://cissi.it/userfiles/files/18801836417.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/28864746317.pdfIn PDF document text
    • https://uangraja.com/contents/files/97903372031.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/kikulew.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/wapatu.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/fepezekobokevuwiriz.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904140120.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/84265331331.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/37304442239.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/tubogavalixagaxibagexe.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/nutesarezopemomi.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/pazexenefok.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/tuwenanumasagi.pdfIn PDF document text
    • https://citronel.com/userfiles/files/nujewemadegofasopijuwelu.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/36442986940.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/ranogenenez.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e47b0edb7c---buzidarupimuwetopoze.pdfIn PDF document text
    • http://saktigroup.in/uploads/zavovap.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ca8f319c---58996298292.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/37050423146.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_off0000bca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA1 16628 bytes
SHA-256: 90dd251b09663263eea5d9e210e9c4f7679029cdbcb1f7ae50717e80f96c89be
font_01_sfnt_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 10456 bytes
SHA-256: fd3ecc6ec69aef203161adc92363ecdebc2d1b93ea6e86345cb1d79b4e1f584c