Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dd0517b3c792a3…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 10:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd88e7bee13e883219a913e8e2b1e3c1 SHA-1: e719f8bc1ed3aab9c4ea891e48464664ab47c3e1 SHA-256: 83dd0517b3c792a36b116776ab7a029cb5026874a66461fe4cfe0897a72b42f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arci-mp.fr/admin/File/79315500933.pdf In PDF document text
    • http://rzn-house.ru/upload/file/bazonewaf.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/80281458059.pdfIn PDF document text
    • http://alvitraders.com/files/93925706688.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/dabapojep.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/lewunodajemowogimazexe.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/wilivalebadifelas.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/zeniwixemisupumog.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/pibaxunirilanemoxoxaj.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210916_3D40DC8E7C7B7ABC.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/pubenosatoronirevavebaji.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/tiromoxagoxalusemugalefeb.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/lixegofegenud.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3f7beb80fe0a2caab1ba279ef52accb1/33390586582.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210901182435_drv4bz.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/gibosezejabixegewaxefim.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/50359821007.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86669630377.pdfIn PDF document text
    • http://cecev.com/stockages/files/xeripobilusunozi.pdfIn PDF document text
    • http://setunari.com/uploads/news/2021/09/27/file/zopirigite.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/juradufofabove.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/1495335170.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/36124233780.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee55a570ab---sajataze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bio+inc+nemesisPDF 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_off0000b282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB282 15332 bytes
SHA-256: 88e6940fb601c184fb360c54e6927c9651a9585e75e2a64177adcd3e4af8cfd5
font_01_sfnt_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 10040 bytes
SHA-256: 057474cba541828eb93869d947784dfc4e234fe6a361a7edf4549b6a0e521bbd

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