Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69a21681f9cd282…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 06:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a87f5615ee3e1a036b1360bd6566874e SHA-1: 5a6434a2c6bcd0fdeca43e3cbde967ecb284bb00 SHA-256: c69a21681f9cd282e6df1bd32ecf49edbae7e8bfa2a770e76b1c009315f8418a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure itself point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://oniceh.ru/uplcv?utm_term=marjaavaan+mp3+song+download PDF link annotation
    • https://shinko-tw.com/UserFiles/file/42023171976.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/78435056626.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0375e018969eb9d2e12fb910b93bcfc6/23773388718.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d8cf0ebc---xivotesulinufuxer.pdfIn PDF document text
    • http://htygroup.com/upload/files/xizidurufofe.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/kowevijaf.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/suzatawufafisowosatiwi.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/zobitisowutaluzanaxox.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/laliler.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/sexome.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/pezudeninitimifodaje.pdfIn PDF document text
    • https://hssanesteban.cl/files/83518381165.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/sumaw.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/mabatapisirudu.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/fepavuxunitil.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/10336420500.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/27712550899.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/motopatunizema.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/13371884969.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/wupufidomifopimevexotena.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/92632002444.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/61245551029.pdfIn PDF document text
    • http://vititanon.com/user_img/files/84891087317.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/71257188254.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/tapijovaseko.pdfIn PDF document text
    • 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_off0000b8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CD 15924 bytes
SHA-256: f96dbcadd77ee8809e6879243bb43c272a56b13547c853743b0a21ad875a47e4
font_01_sfnt_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 10860 bytes
SHA-256: 773644bdc4e1ade1804c45912c13145f4b8beee9274938bd0e88561e8726b12f
font_02_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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