Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3bee1d8d2c2d14…

MALICIOUS

PDF

96.7 KB Created: 2021-03-22 18:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c57cd5c2260309626ae045e67a8d5e1a SHA-1: d0130528cef76835a782cb5e131b9d849e524fc0 SHA-256: 2a3bee1d8d2c2d1470201025d2b36223231eb557d4091aec6dd8152858217ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection scheme. The embedded URLs likely serve to direct users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=subjective+moral+relativism+definition
    • https://cdn-cms.f-static.net/uploads/4462678/normal_6049598ea40f9.pdf
    • http://rezltml.xyz/mupokamosipotukyfbx.pdf
    • http://logoped-samara.ru/66530813049hqnt2.pdf
    • https://cdn-cms.f-static.net/uploads/4421612/normal_6049df23d6c06.pdf
    • http://chambreop.xyz/34101927735fxv1z.pdf
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5fcd36f85039a.pdf
    • https://cdn-cms.f-static.net/uploads/4423431/normal_60222c126ca64.pdf
    • https://wuruderow.weebly.com/uploads/1/3/5/3/135389815/7928100.pdf
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014c921b55fb.pdf
    • https://cdn-cms.f-static.net/uploads/4407304/normal_60263c918d8c1.pdf
    • https://cdn-cms.f-static.net/uploads/4454042/normal_5fd16e5af22d5.pdf
    • https://butonobafogiz.weebly.com/uploads/1/3/4/6/134607318/ec066199e1.pdf
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fcb4f80c28c1.pdf
    • https://cdn-cms.f-static.net/uploads/4496810/normal_6020f95e96cba.pdf
    • https://static.s123-cdn-static.com/uploads/4498978/normal_5fe3582c5680c.pdf
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/sokebedu.pdf
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fcb64e33cf08.pdf
    • https://static.s123-cdn-static.com/uploads/4452588/normal_5fca021faca13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remuv/akele_hain_chale_aao_song.pdf
    • https://s3.amazonaws.com/dopugaxelelema/82221749062.pdf
    • https://s3.amazonaws.com/towakog/accounting_standard_9_revenue_recognition.pdf
    • 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://scripts.sil.org/OFL
    • 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_off00012316.bin
c577ca2548692808e942083a861a92f65b4973bf58d87e979d97761d156c8ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 5544 bytes
font_01_sfnt_off000135dd.bin
9f0a5e306680a744761b797ea6770b5b6d370b0a52d2f9bcf4a11bf2e3227924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 12656 bytes
font_02_sfnt_off00016057.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16057 16060 bytes

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