Malicious PDF — malware analysis report

Static analysis result for SHA-256 befb1cf0ec9703d0…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 21:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a087673020a60bbb8de259ed2b046a35 SHA-1: a2957dbeafd1a428bf09223660363b5e0a125c5b SHA-256: befb1cf0ec9703d06863cf824ba7851afb8506b80f87935c0cb34ae24aafe062
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mayepnuocmia.vn/data/ckfinder/files/mezutipixud.pdf In PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/miviw.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130547db21c9---60140101537.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/kupifir.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/tarexifonafa.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210911134930.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/69424176739.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/goribir.pdfIn PDF document text
    • https://ijp2.com/contents/files/nujazufolubekuj.pdfIn PDF document text
    • https://olterus.com/contents/files/fuzuvatugaf.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109131843275458.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/94616637160.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210912015939.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/tuvajen.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/71898956121.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210903122805_gj9f44.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/99965648076.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/xewenelituzazolojeluloxi.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/28107173156.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/6201907168.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/88535851365.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/54159525187.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/40644176854.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/kerizawapepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+fake+gps+apkPDF 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_off0000c7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EA 10216 bytes
SHA-256: 09da3977385fc3abcf224f9d943f91d521f05365e00757e37c76fd45a86965c5
font_01_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 17648 bytes
SHA-256: b9fea1aa9a0630f153c3f3479f2c4f1dfb72072114cc30bc5a4f3d6887b9d8d9