Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3f4aaa62362cc3…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 08:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 209076145949124b8c448aa6f67347a4 SHA-1: 5a3db4fde43c79fa24b9849de40ef5d1378fc9eb SHA-256: cd3f4aaa62362cc3c3c68de5f0faa30fd6c88400e1eabf0d4fdaf1e12a1764d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/tisabipitik.pdf In PDF document text
    • http://ellissi.org/userfiles/files/8420239351.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/57332525096.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/4135506498.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a3c9b7f1---sivebowa.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/bufukogubonunotukawovikud.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/wenuxan.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/gitigutodunowe.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210915_215307.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cfe2f76c---ditud.pdfIn PDF document text
    • http://accronline.com/userfiles/file/rowolisuzitupumijemu.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/pupiterupumu.pdfIn PDF document text
    • http://chongros.com/userData/board/file/19966253851.pdfIn PDF document text
    • http://abnicum.com/files/file/87258355987.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/29112625635.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/46124660767.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/zanegejubivevolusixofo.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/gizezegalepoke.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/46549953433.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/29272814949.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gumidosukovekolejagepe.pdfIn PDF document text
    • https://songhongresort.com/img/files/xazibarivarixudotaxi.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/33710493100.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/bipolugupidalulogibeke.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/wisubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rgb+live+wallpaper+androidPDF 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_off0000bca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA6 18476 bytes
SHA-256: 791aff8d56ec827e0b2b3bb7afc2d170c065ade661492b704bb4fb6777b2cd98
font_01_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 10640 bytes
SHA-256: afc3bff7dfdca8ca775b13164bcb37b69640a985177dd2b4e769a460e5fe74d2

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