Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a86056c5dd48e3…

MALICIOUS

PDF

77.8 KB Created: 2021-05-17 19:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12e8a496f851e4e652a02084fa457d38 SHA-1: 73f4349c97d00589dad91c1869f85b7ae33a9c72 SHA-256: 21a86056c5dd48e35fa75a1c68d603f4445e64ded57be91c3097d7c6162479b6
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://jacksth.ru/strik', which is likely used to redirect the user to a malicious site. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+does+dell+active+pen+do
    • http://tomogorman.com/residential_lease_cancellation_form_texasf24fj.pdf
    • http://about-fb-support.com/cgp_gcse_edexcel_biology_workbook_answersigkwc.pdf
    • http://xidufefonudug.sportsontheweb.net/55203292309.pdf
    • https://cdn.sqhk.co/wudenedu/gpMcic2/how_to_make_my_smaller_mac.pdf
    • http://gaximivotekole.mypressonline.com/vancomycin_hcl_davis.pdf
    • http://consumer-data-protection-bureau.com/cisco_jabber_for_android_phonehmuov.pdf
    • http://momarivido.mypressonline.com/24881722297.pdf
    • http://kamikofonem.mygamesonline.org/tosekopemijawigaviw.pdf
    • http://liruzirese.22web.org/69812227364.pdf
    • http://siteznakomstv69.space/503573687603azcf.pdf
    • http://tewezivigu.22web.org/abdominal_wall_strain_exercises.pdf
    • https://cdn.sqhk.co/sixitigoxeto/iijijKx/wurowetozi.pdf
    • http://pabazumakubonok.66ghz.com/54535369285.pdf
    • http://afracheat2.xyz/39874787707pt8tz.pdf
    • http://wifunagidoli.mypressonline.com/55418988505.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://baxaxogi.rf.gd/8612164043.pdf
    • http://lemujiv.epizy.com/background_png_hd_free.pdf
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_95d2655962bd4721904150a58522db2b.pdf?index=true
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_1c7a30c6afb243a199c74555c598736d.pdf?index=true
    • http://xetubuvij.rf.gd/anna_karenina_novel_free_download.pdf
    • http://lawosavamog.rf.gd/amarakosha_in_kannada.pdf
    • http://josegofubusem.epizy.com/89997239069.pdf
    • http://jodirebimufesa.epizy.com/basic_of_computer_science_book.pdf
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_750b05e72ee8487a8f766a1569273adc.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18a.bin
39bbc47bb90beba67eeb3ac06f85aeea67e9db3a8b4cbe244aecba8ad07e06c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 5140 bytes
font_01_sfnt_off0001031b.bin
3150bd94613e6fc54c86f66678fc649aee1e675eff196657e0f82e60fcaba402		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 11324 bytes

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