Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86e868f2aedb843…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 08:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4793f97b67e0b01958a43cc1e6ac35f1 SHA-1: 7b2f1b8e1cfb42135ff30dbfd19e0db24b764f5c SHA-256: e86e868f2aedb843e2fc2ea066ab7bde287534da7a6eb8f88cdfe9bbbe1882f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on low-reputation hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • 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://olymp-kiev.com/temp/fckeditor/file/95952071877.pdf In PDF document text
    • http://irinaburmistrova.ru/files/80342057548.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/tomopuseludufofajupakelo.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/mevus.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/dojizet.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/wotikidenugasuraze.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/fogoge.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/jodesumegaguxubapovixagu.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/76476023363.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/korokan.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/28387547611.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/fisozo.pdfIn PDF document text
    • http://falconltd.pl/cache/file/67782592304.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/nupudal.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lq1bac5hsfdkkni1u5n6ug76ms/84365627895.pdfIn PDF document text
    • http://humanlitech.com/files/files/64601853288.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/tatoloduzapojokedag.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3cf051ba---13794082632.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/sovezulelokebitusarilet.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/gexukedasirajufarofewavu.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/kasuzinunidip.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210913_7DD8222BAC8BA44A.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/8656520018.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/rapenekabupivinilaziziwir.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/86905724310.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/larunaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=jalwa+tv+apk+2021PDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/datenuf.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_off0000beb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB3 15948 bytes
SHA-256: 0a391b97f440ef2ea7f794f79f33625eaa84e68891b130b734e08a43da600063
font_01_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 10056 bytes
SHA-256: 1c27bcab54c03d5db4ce575247b727cd5e82d500eb98ca4fb12de0d4736808da
font_02_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1