Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2c31f0646cae6e…

MALICIOUS

PDF

68.1 KB Created: 2021-03-28 11:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45c632c96764602f0258af20624b10f2 SHA-1: 7555033137afed4a8f9c1e9dbe0a737d3f4fbf4e SHA-256: 5b2c31f0646cae6ecdb53ab1de3f905059fa2e40ac51a458490ffc17a182a8ff
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm, suggesting it's designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains text related to 'Base64 to file pdf online', which is likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

Heuristics 4

  • 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
  • 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://xezojetit.ru/award?keyword=base64+to+file+pdf+online
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/e7f23e.pdf
    • https://cdn.sqhk.co/gixelotopa/jhgUQhi/65403347806.pdf
    • http://adminhalil.com/what_happens_if_you_lose_your_gold_passport_in_foreign_countryupmig.pdf
    • http://chtotakoebezuz.biz/8131165959445vbo.pdf
    • https://cdn.sqhk.co/goberirud/3StKK3e/43570625797.pdf
    • http://ita-women.space/daddy_s_goodnight_kiss_guide9kf3r.pdf
    • http://naturaitalia.space/612857225844ovh6.pdf
    • http://tdsevsvet.ru/palanga_autobus_stotis_informacijao7ltx.pdf
    • https://loloxemevo.weebly.com/uploads/1/3/0/7/130739498/fukixoja_jibosikisunuz_fifov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_f9bf62ca149d4ae695da8bde406b4cb2.pdf?index=true
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_d63ccd429484428a87aabaae3e009336.pdf?index=true
    • https://s3.amazonaws.com/wowonesoribu/3ds_max_foliage_plugin_free.pdf
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_006cc9d432ec405ba6a6c535f88b5db8.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_e85c0d85cebd4a50bd4b6eb3538d41bb.pdf?index=true
    • https://s3.amazonaws.com/jujadodedaruxix/what_does_psychoanalytic_theory_mean_in_literature.pdf
    • https://s3.amazonaws.com/begijufadi/kagogari.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e4.bin
16d22848b781516752d623c564d0b037c9f187167bcb5ab95ae2e059585532c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 5020 bytes

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