Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9fda830d764500…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 16:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57580af7ce30e225d76580790864e671 SHA-1: baab0f49bf2c03768ef722f78c10d416a7ad5d87 SHA-256: 0e9fda830d764500f16a31f15c117c976daf429957c5f278016d6597666a5a39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the nature of the PDF and its numerous external links strongly suggest it is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://newsale.linyn.mobi/upload/ckeditor/pages/files/36141540499.pdf In PDF document text
    • https://mr-alian.com/upload/ckfinder/files/20634053913.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/26535989577.pdfIn PDF document text
    • http://skene.es/userfiles/file/robafujoduvigedini.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/genapazavawefoveba.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/80281119588.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/lefezibaguzoraledovizozi.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/kizukadukolifotebotida.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/reguwabema.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/12893621188.pdfIn PDF document text
    • https://unosms.us/userfiles/file/30562731457.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/131153568.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/89571644905.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/14244090618.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/99741051496.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/refewefolalujabisagemipaf.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/160756595502.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/89599266333.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1b67353fc67edcaf44792d2701476a1d/nutekiselakiximaver.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/tuxejokolukitumuzufubonef.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/36291171206.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614406564d686---fomibekufasulegiguwotedux.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/54312848302.pdfIn PDF document text
    • http://sbcnepal.com/images/file/11328526772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=11+letter+word+beginning+with+cPDF 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_off0000ae8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 10500 bytes
SHA-256: e27b8792f96d55325e8454ce465dcb27e8a4a7fa6b4a8c5ec40ac1058d03ed3b
font_02_sfnt_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 14972 bytes
SHA-256: 6a91d02bd87742055b323c1584e8c569a2282243451e0054c94717c26dadef6b