Malicious PDF — malware analysis report

Static analysis result for SHA-256 9865a4c65ccd1635…

MALICIOUS

PDF

73.8 KB Created: 2021-09-23 10:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68392daf35238275c01d668d71afa729 SHA-1: 3e173f64ec50ea44b650ec3891c02242f000dd02 SHA-256: 9865a4c65ccd16356e1832856f4ceb498278d0d11a5030f27d8a80e02fdd04a8
166 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or plugin. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binusiwigafajezifakileban.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70ba1995a---44431458341.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wemevufedikigarudegilasur.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/ginepoturirovuwi.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/rusivowegopa.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/61519667928.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/25230616928.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/21080726022.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/xevijoretomale.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/84349567611.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/sovopupemajugiju.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141887cb1f1b---wixidonuwujava.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/bolexopureka.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/raxoda.pdfIn PDF document text
    • http://tai-group.com/upload/files/28174418782.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/kijogotemo.pdfIn PDF document text
    • http://paradoxine.com/upload/files/nobifomab.pdfIn PDF document text
    • https://istanajp2.com/contents/files/58603673696.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/dalikevi.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/ronoliduxedefepig.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s3sk5d0qith3sq5f9diqj4pvas/50049871009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=autofill+keyboard+androidPDF 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_off0000be30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16664 bytes
SHA-256: caa83c8c105b16b8d11d01f7deb2dd6980a1782f554f4d63a4249ad42ae8f4ab
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 10604 bytes
SHA-256: a24f8f210d8bd6c4e5a71105075cabbed4cbb91e9ccfbb731d10f5ea42c2ef65

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