Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d356ed3438ada2…

MALICIOUS

PDF

79.0 KB Created: 2021-03-28 13:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5fd02a8ad4f524e5089c947c73e3dd7 SHA-1: 9f34daf653acfd890602b02ef45760c922196ebb SHA-256: 89d356ed3438ada2243b2be5ca237c49b151c0a72ed74c6312fab76cfde21ec9
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple embedded URLs, one of which, 'https://jacksth.ru/strik?utm_term=excel+formulas+shortcut+keys+2013+pdf', is directly associated with the PDF's content and likely serves as a lure. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=excel+formulas+shortcut+keys+2013+pdf
    • http://suruwafid.22web.org/blacks_law_dictionary_6th_edition_online.pdf
    • http://lelekelosutov.getenjoyment.net/pdf_reader_add_on_internet_explorer.pdf
    • http://lumekosufanegu.iblogger.org/zosanovi.pdf
    • https://cdn.sqhk.co/xonafelog/hbsUjhJ/bounce_tales_original_apk.pdf
    • https://cdn.sqhk.co/webuzifinuno/1BUNieJ/75718142354.pdf
    • http://gojawufeki.getenjoyment.net/24708929763.pdf
    • http://lerimofo.mywebcommunity.org/technical_analysis_investopedia.pdf
    • https://cdn.sqhk.co/kofuvufexo/hhJjj6W/wordans_clothing_store.pdf
    • https://cdn.sqhk.co/tivinarafuvu/xhhPBfh/flipkart_customer_care_number_just_dial.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xubotosojoruto.epizy.com/zeperogujobarukanavira.pdf
    • http://wagulekamiwegur.rf.gd/how_to_draw_a_mind_map_when_studying.pdf
    • https://uploads.strikinglycdn.com/files/202382b9-6ebd-4701-9e39-1266b7b7c1bb/dexigaku.pdf
    • https://uploads.strikinglycdn.com/files/6a9ec4c3-2cfc-471c-8067-516d5696cffc/dapizerab.pdf
    • https://s3.amazonaws.com/rejiner/banlieue_13_ost.pdf
    • http://mitotubuxabax.epizy.com/advanced_excel_vba_programming.pdf
    • http://forezepolutaju.onlinewebshop.net/11449801202.pdf
    • https://s3.amazonaws.com/wikurixobelu/characteristics_of_information_system_security.pdf
    • https://uploads.strikinglycdn.com/files/37e8fe33-bc1c-4a5d-9ebc-7426828f188a/34005816620.pdf
    • https://uploads.strikinglycdn.com/files/dca43be4-170d-44b0-b51e-70d5299bd5e7/vipos.pdf
    • https://uploads.strikinglycdn.com/files/4122b009-b6f7-468d-b5f2-effeabf270c8/where_is_the_7th_special_forces_group_located.pdf
    • https://s3.amazonaws.com/neporezofov/vegurifibusuru.pdf
    • http://vibanizudapitik.epizy.com/medicare_claims_processing_manual_chapter_12_section_30.6.1_b.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c6.bin
ed488467f15273fe11f4a7d8fb2d704871e07374784837b4b007b84e17610f56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 5804 bytes
font_01_sfnt_off0000fb92.bin
0766270ec0cbce8b3365d3b954f5a69e41e09ce779fa40e793cd0cd10fe9f25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 10696 bytes
font_02_sfnt_off00012067.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 4324 bytes

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