Malicious PDF — malware analysis report

Static analysis result for SHA-256 61273a5b65c49f1b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 19:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 48a0a4c143dbd6ea6e714ee1e2530787 SHA-1: 55e3ae55af9bc7673e2237d6b3d87ebc2465e01c SHA-256: 61273a5b65c49f1be2d37cf6c3239d73bf206dbfd89bc8a69264d5e2eab63e32
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the PDF is designed to redirect users to a network of potentially malicious websites. The ClamAV detection further confirms its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://schachverein-marchhoefe.ch/fcsr/news/upload/file/85610280155.pdf In PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/25794688668.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jiwuvejodinuduzevixakagop.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/gubufidabufulenigoxew.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/moditupalupolo.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/fokotamadem.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/gasesusatoxuxabak.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/tiwojekuzobudutasilorupap.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/78603456124.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/10532028833.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/78057701392.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/44079361662.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/tukologom.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1614d85c654d6f---99441629713.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/62ea8fa0f86fcd15b5491704698c2852/78903350593.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/71178130351.pdfIn PDF document text
    • https://pokereshop.cz/data/file/99864032275.pdfIn PDF document text
    • http://myphamasia.net/upload/files/74595439120.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/75032348965.pdfIn PDF document text
    • https://telenovella-bg.com/files/defejidaruras.pdfIn PDF document text
    • http://52963566.com/upload/file/202109242306420664.pdfIn PDF document text
    • http://www.terraton.com.my/ckfinder/userfiles/files/39181343263.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/vukipabukusowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=iphone+style+instagram+for+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_off0000b3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBED 17984 bytes
SHA-256: 3ab013ea65ae1caeecd22c837f91b659768b1db710f86b3e0b11da259c6f4852
font_02_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 11008 bytes
SHA-256: fbf7375eeaab8f0d4de60d17365cd0e9503ea903a5559dd259db1b3e83fdccde

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