Malicious PDF — malware analysis report

Static analysis result for SHA-256 260c7d3307dbc952…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 19:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 070a8d214cc562218d07dae5d39d18c2 SHA-1: 9045180004d6044582d05e47ebf2119442d2988e SHA-256: 260c7d3307dbc952987936d923dee109cb649f20818bbcefae291bde1f4e5aa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination, and the ML_NYX_PDF_MALICIOUS score is very high. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://suruburi.net/mm/file/93085300992.pdf In PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/rilig.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/35915774035.pdfIn PDF document text
    • http://poorclarescork.ie/images/wawapuzenikasarojesenir.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/farix.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/vodugeler.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/62896322721.pdfIn PDF document text
    • http://bakoca.hu/files/file/57602591421.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/pekane.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/babiwiwemixajasejujibuvuv.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/47292402234.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/mukazuxibudanovinek.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_221617_165.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/85512031011.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210903043245.pdfIn PDF document text
    • http://pmke.cz/pictures/files/basuxabipofajex.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/8908702403.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8bad93769bd4b15a8f36e4e338032a74/76643927593.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210912_122605.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/vegoja.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/tanaloxon.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/7742739714.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7b6f3739---32594760753.pdfIn PDF document text
    • http://mobilenmr.com/files/files/nobejurixemubugajawo.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/79540574216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+android+can+do+that+iphone+can+tPDF 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_off0000bb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB67 10392 bytes
SHA-256: 0d673da92f6a92b25cf4f57d060033119c924de2eb45cbe75d579caeb673ebe3
font_01_sfnt_off0000d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 16452 bytes
SHA-256: 3042b9ee50d5a4e6133f68f1980fd0a561fd12e1fe9df99277480adbc1235f79