Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d8149c1ec2d88e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-14 00:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67e0a39fc5ab1bce62c09c1dce127031 SHA-1: 7e2262a42f00e95f90b9c9db4e4ea4c8c1386a7d SHA-256: f4d8149c1ec2d88e685b23c2258446c7bfa9c2dc45994d582798e5a7395d20d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the PDF_URI heuristic and the presence of multiple URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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.
  • 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://noahmission.org/dataroom/file/xatuxixibiwijafagoxoti.pdf In PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/vefakuvupifuv.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/72055325729.pdfIn PDF document text
    • http://sro52.ru/uploads/files/linibelezi.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/nojotoxitixikodeguvepu.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/95843194430.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/50914675561.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/fujibigaleputun.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/migukikategun.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/kobekenameterajewe.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/35482971512.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/33029411209.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/79275332643.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/42381529388.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/11011302326.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/41603379186.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/10810365492.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/dikunumelupelebo.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/75087419320.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/c3d98e.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/pijuba.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/62395463487.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388bde904e---90324518687.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/26116877687.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/10382318831.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8424dd8a1---nulebisarunorosukaran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=samsung+galaxy+s4+install+appsPDF 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_off0000cd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 16796 bytes
SHA-256: 29a57efdc2f4da8542f577fd8ba66f3a08ae3ab38571e3490667c7cd8e5657cc
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 10712 bytes
SHA-256: 1dbcf8e73641d2dd3af5eb67631f050395d4deea44b4e8b1e9818d4167f49efe
font_02_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1