Malicious PDF — malware analysis report

Static analysis result for SHA-256 732f5fd6c7ff6ab0…

MALICIOUS

PDF

79.1 KB Created: 2021-02-14 01:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f50819f72603bea8894619b875c553f SHA-1: df0d2172d167da7ac2308c913c17e43589b5c6a0 SHA-256: 732f5fd6c7ff6ab09e95ce9c415524b5efdee25dfab2f4f9172a90d30e24cf25
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites like 'jacksth.ru' or 'rollernefritmassage.xyz' for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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/wix?keyword=exodus+quiz+questions+and+answers+in+tamil PDF link annotation
    • http://rollernefritmassage.xyz/cashew_chicken_sheet_pan_mealjp50k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393898/normal_5fcee51308fda.pdfIn PDF document text
    • http://babysampler.com/8083047499104tax.pdfIn PDF document text
    • https://zumusikibalagop.weebly.com/uploads/1/3/4/0/134096359/duzim_xewolisebo.pdfIn PDF document text
    • http://nicechange.space/rivijinokabuviputiwakukja1b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_5fdf3c31e1199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_600818ea7ad4c.pdfIn PDF document text
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/6350905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5fe65548a930b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_601cfd2ee86fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414331/normal_5fc5bb26d97c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fe4d84670fe0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 5144 bytes
SHA-256: 369b209ebe60465cce5755b9e35adb28cba220a808eb39d7b02ab585c989a3d0
font_01_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 10440 bytes
SHA-256: bc6cb26a22a7d4f9329a6ed5d55c2c44019834f0fdc82058cfbbb72a09e17cce
font_02_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_03_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 2832 bytes
SHA-256: ee8afa51e50492bdf4d25b6b01818d2021856a0eb5271b70f188e6d094f25891

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