Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0f70b9f04f7c21…

MALICIOUS

PDF

81.9 KB Created: 2021-03-07 00:36:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b5b543cd601633cabce7094eb22af7d4 SHA-1: b55b697599e4552fc900c62ee4e640fa6e34fe4c SHA-256: 1a0f70b9f04f7c218d5714d65134758df2702a179b47500edd3f459af7a07460
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic identifying it as a link farm. The primary URL, 'https://nipisod.ru/wix?keyword=wo+ai+ni+ai+zhe+ni+meaning', is suspicious and likely leads to malicious content. ClamAV also flagged this as a phishing trojan. The document body is heavily obfuscated and contains what appears to be garbled text, suggesting an attempt to hide malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=wo+ai+ni+ai+zhe+ni+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484169/normal_602fa3d0c1001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_6000d685d48f0.pdfIn PDF document text
    • http://wibimozuj.22web.org/what_are_the_three_essential_elements_of_a_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5ff7db83058f1.pdfIn PDF document text
    • http://contact-git.top/86518770362c1vf6.pdfIn PDF document text
    • http://lavkavkusa.store/88248442439d3de1.pdfIn PDF document text
    • http://starconflict-game.ru/absolute_value_word_problems_worksheetsaen6r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_5fdb9de368d69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipoxibel.epizy.com/eagles_vs_falcons_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/61513945338.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_61f2de920dda47e8afc2c8303529e714.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/xujevalu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/8646753332.pdfIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_1f7b34e9b3094241a27086c6d17776e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/success_criteria_non_chronological_report_ks2.pdfIn PDF document text
    • http://lebekuwawelu.epizy.com/xomuveguva.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_818bec2d6a7346309bb05a60b6b4e816.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/resumen_completo_del_libro_100_aos_de_soledad.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_085fd95f97c24f579682bf591d7e8c1e.pdf?index=trueIn 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_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 5268 bytes
SHA-256: 7c7c4aa1122cbe14b884bf946e589ccd71472c61ff1fcc6d0d6417140533e8bf
font_01_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 4856 bytes
SHA-256: 7769d2282aac94e46ee28bb07a1c6893d8c4652772e62a460835c301c7e2e3c1
font_02_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 14852 bytes
SHA-256: 1c5d6be7eb4ead97d4919bc77a671af73672a7b1813e5fb8c14ece74772113bf

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