Malicious PDF — malware analysis report

Static analysis result for SHA-256 4599ed2f06e7d50c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 10:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa8390b90c464f0f7291111a422ac911 SHA-1: af8cd186ae58e0b04510ff9dc2de16b070f32834 SHA-256: 4599ed2f06e7d50cb4bffa691d62f9012db5e2b84332b88faad62e1638e27c00
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing campaign aiming to deliver secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/35789528372.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379d7f7f6c8---jejegetitadobowiramimerad.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/34313194383.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/xujef.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210916_BE9F13B92684A361.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/79872165562.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/81438936628.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/69469546808.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/92596394572.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/35408814134.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091105195895.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/77934517524.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/tabujovisav.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/8157583632.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138891842652---namifodupesigosetudaxo.pdfIn PDF document text
    • http://labradory.pl/file/xesexik.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/buwibar.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/botase.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/tuvodebawaporuxonavut.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/mizilotaterubolejimeg.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/61392620167.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/9038014764.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/3466376331.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/kudizosajoligazejatupul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+tv+free+browserPDF 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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 10412 bytes
SHA-256: 365bb179d6e60475a504d4a4e6bf968d402ec402bfb5a13da82283127712db67
font_01_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 17012 bytes
SHA-256: 97c0b1447d9c6bb1ea2b7b78393b5a8246bccfad89c05186be2ebf755912752a
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1