Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f83229790ad5b4…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 17:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d2cf12db185c9dcfff078095be03393 SHA-1: 56e8be81737cfabc69ec64edb5f6afcbfef8746a SHA-256: 13f83229790ad5b404120157c1724cbb4ce8cedc635d8f9e1ace012c5917a9ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to suspicious PDF files, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is designed to host a large number of links, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://efrex.cz/files/file/pivanamotadamufes.pdf In PDF document text
    • http://hoya-system.com/uploads/files/202109011033257373.pdfIn PDF document text
    • http://asid.rw/userfiles/file/jexupirogezizageviruluk.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/pegodadasisibisepixak.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/nasunamasamimuxezakepavu.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/kuseborogofesozebadaxijo.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///ganut.pdfIn PDF document text
    • https://sambelteri.com/contents/files/levajekij.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/58031061499.pdfIn PDF document text
    • http://tdbm.vn/upload/files/64682519017.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631288814.pdfIn PDF document text
    • http://htygroup.com/upload/files/75575907996.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/zadomakatukilewavuluxub.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/gimariroporovures.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109110904289939.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9ebd65b6---14994848576.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/5938710747.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/52217835346.pdfIn PDF document text
    • http://quetthe.com/upload/files/waroxobabitopegagapixodum.pdfIn PDF document text
    • https://tcremich.lu/files/files/duxixugaludavisidowa.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/94619209502.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xegepulavozamil.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137051ea0eda---mobakorasabazekiwade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=new+song+2019+download+mp3+pagalworld0PDF 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_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 15752 bytes
SHA-256: 36f4de14b88306de0ba6cdd34bbf32d14291406a82689124194ef08a073a6208
font_02_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 11244 bytes
SHA-256: eded62e253416826ff5403a76fa2f5bb8de6c0f8e8b9667668c2b594fba3c4df

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