Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ff1d838fe6c432…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 10:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f6ba74f7d5335835ebfb03b1812fcbf SHA-1: 40423e739ba0bf4efa8dae13088f5f78611949f4 SHA-256: f5ff1d838fe6c432af98ec83341295fe7e40a8dbee599d42f6dc7a43b0fd9eec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which are part of a link farm designed to redirect users to potentially malicious sites. One prominent URL, 'https://chcial.ru/uplcv?utm_term=download+game+attack+on+titan+2+android+online', suggests a lure for downloading a game. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=download+game+attack+on+titan+2+android+online PDF link annotation
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/dugolovegifokokigiwokidot.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/sirepirovurulagelewilo.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/8015840275.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/92586139164.pdfIn PDF document text
    • http://acril.ru/ufiles/files/65277539646.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/tewezemamorevikigulixaz.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/tufajarokim.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/20709892121.pdfIn PDF document text
    • http://centronegozi.com/public/zijanexomadewasilebejini.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/soxenovejowalovijeviwer.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/48714725661.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/mopukuvegu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/75248274397.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/92016306432.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210911_D1FA75C1CD901F79.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/47818578898.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/28578830153.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7db333830---panufagamidasizusuxuvofat.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/87914639642.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/jugipo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/55d3be4dc53ad95ba0f1af458ccd493f/kikaluzatigexad.pdfIn PDF document text
    • http://goldmustang.com/files/files/funudurujina.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/75578128864.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_off0000bad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD8 18164 bytes
SHA-256: 9fce247e2e4653fee650decf9f0330a1fd68225610940307061bcc6ee6762714
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 10844 bytes
SHA-256: 5facefd0210e24460747964bfe22b7ca504df448d75ea4006a14ff906fe75ed6
font_02_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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