Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15e629dce3ddee5…

MALICIOUS

PDF

79.8 KB Created: 2021-03-03 17:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f4a0d68beb8731c6e62a85511cb55549 SHA-1: 7fa5cb43d21692be5c09acaf520c3024aed4b257 SHA-256: c15e629dce3ddee5d13d833f408d66fca04374df95f765e4ca4b1b885e0adb9f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'jacksth.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/award?keyword=oedipus+rex+themes+slideshare PDF link annotation
    • https://vabakapis.weebly.com/uploads/1/3/1/4/131453405/975c2ffca096660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449184/normal_5fd05b12e0db4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418747/normal_600079759492f.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/how_to_start_your_own_blog_website_and_make_money.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/domukatigu.pdfIn PDF document text
    • https://gifaxopolipo.weebly.com/uploads/1/3/0/7/130739444/4771789.pdfIn PDF document text
    • https://dedezeke.weebly.com/uploads/1/3/4/4/134494225/4870903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380523/normal_6008e984f2c10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5fdd3db0d07d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420597/normal_5fde2530b0598.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/76319222466.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/ds_emulator_android_with_cheats.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/alphabet_handwriting_worksheets_with_arrows.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/53070676426.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/somusabemijarakinud.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 1644 bytes
SHA-256: 78d6f9b95c44e4526a1cac9e6c4f51d9e03b34b00024e82f077290e128785745
font_01_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 5292 bytes
SHA-256: c38dc8c468e355f9e4d85a031c4369c9358a5a5bbf711b128cb6edfed7e1b9fe
font_02_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 10528 bytes
SHA-256: 25a3d6ddf8bf296bba9963172e5d925cd466744cec4e58624789c684835d2907

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