Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19e2e2a76650566…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 13:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8982892e5ee53a7a4e97d3aa7a4c03b SHA-1: f31b2d6b1ba6dd3fd15f6ef73011247e5707b61f SHA-256: b19e2e2a766505668cce79ea4acc4c73e2ffdc5ac00e3d6320cefbb5c60ad40c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to trick users into downloading further malware. The ML classifier and ClamAV detection strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://anpheatingandac.com/nbloom/fckuploads/file/furason.pdf
    • http://www.farmaciapenil.es/userfiles/files/14792497736.pdf
    • https://northcoteplaza.com/userfiles/file/19373335411.pdf
    • https://pinkrali.com/calisma2/files/uploads/88556355631.pdf
    • https://indicaperu.com/userfiles/file/xadebutatifokorisi.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/49100168356.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/wikotomatovosubiruk.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/sulupis.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760c73f616---94287053193.pdf
    • http://tsnpharma.com/upload/files/56482058834.pdf
    • http://frigotechreina.com/userfiles/files/51650100157.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/iesf2gfcnhj3rrfk0i88r066n5/kumezumituli.pdf
    • http://ngor2-3.com/file_media/file_image/file/videpaxonoretan.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/rugobedajor.pdf
    • http://zabbeleecooking.com/ckfinder/userfiles/files/3127776595.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_2E0DFD684ECBEB13.pdf
    • http://sinosteelcode.com/filespath/files/20210902180909.pdf
    • https://vonia.mikludava.lt/images/files/65118230671.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/ketidemepijimavovamowef.pdf
    • http://sibinetweek.ru/userfiles/file/monabaxitomiganezod.pdf
    • http://thebodyclubonline.com/userfiles/file/vamefelafepuxidupip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+inshot+tanpa+watermark
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65d.bin
1a21a7b55738b745fd46b1239adca65c7abbccbff39a3295c84fd93d935d890d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 18476 bytes
font_01_sfnt_off0001171d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 16792 bytes
font_02_sfnt_off00012f34.bin
41b30cee4cfd919c71feeb1b7958686170db351975e5238848c54dde8e56aba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 10836 bytes

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