Malicious PDF — malware analysis report

Static analysis result for SHA-256 4617abcae21884f9…

MALICIOUS

PDF

89.2 KB Created: 2021-09-16 17:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91c31948734f07bc91270369282710c6 SHA-1: ed68290666a326d6aa56382c6cb021d8eaf72c17 SHA-256: 4617abcae21884f918555d2c565dec8ccdceb7c12b0e6bd090cb452b7d95497b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to host malicious content or redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://rilta.net/userfiles/files/66089275452.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e26e8e8354---xezisanokedupu.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/famimikubunifalagi.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/gujefemezigo.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/nafusefizudu.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/jelagemo.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/14139415777.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/33733396788.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/jonemaji.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/60637838912.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5ets9kelafuolsspt5livi6ld1/62424980910.pdfIn PDF document text
    • http://grandfiltr.com/files/file/kamikerularekifojiba.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/tijog.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6391ca68---64087418234.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/32321139718.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/gokezogivez.pdfIn PDF document text
    • https://uangraja.com/contents/files/xupob.pdfIn PDF document text
    • http://riviera.az/userfiles/file/34352088147.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/44934567478.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/rugugejizutalad.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/90787480563.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210915_100354.pdfIn PDF document text
    • http://consade.com/userfiles/file/jijinosuzuwalavopipiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=two+mindsets+carol+dweck+pdfPDF 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_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10920 bytes
SHA-256: 267029274d355d9d47bfeb1196804b0ca359665ffae483f3927f491e49bef5ff
font_01_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 18264 bytes
SHA-256: b6de61bcd67a43c922ee8e3ddd9268cff4d30dfcd455dfecf33e0d1b46112917