Malicious PDF — malware analysis report

Static analysis result for SHA-256 16db923992d56acc…

MALICIOUS

PDF

87.1 KB Created: 2021-02-22 19:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5307ed5ba02dd669056c839361290a39 SHA-1: 8f56584893ec8f47e333c88870b37e0037410674 SHA-256: 16db923992d56acc9ae245ad1e93eb885ed0adaa16f4a0e3af4dccff209d7b04
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that leads to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Beethoven sonata no 14 moonlight', suggesting a lure to disguise the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wb?keyword=beethoven%20sonata%20no%C2%B0%2014%20 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5fda8804a8fc7.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/biwoxopusutett688.pdfIn PDF document text
    • https://cdn.sqhk.co/tanemurad/rMphgih/nail_salon_in_walmart_plaza_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_602b5e814fd56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5feb88e42f348.pdfIn PDF document text
    • http://about-central.com/definite_article_with_geographical_names26dwk.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/FcEiggh/hd_wallpapers_1080p_download_for_mobile_car.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/7Ar2OJO/does_cat_noir_call_marinette_princess.pdfIn PDF document text
    • http://rent-nout.site/gikixiwokarugirix0lb2q.pdfIn PDF document text
    • http://sokfresh.fun/fovomo6yznb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388819/normal_5fcb6c998554b.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/eghjhqh/spiritual_meaning_of_bird_landing_on_head.pdfIn PDF document text
    • http://milanomoda-italy.website/how_to_reset_holmes_space_heateryigu3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/physics_half_yearly_answer_key_2018_11th.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/13249809174.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/mixovupafor.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/4_point_likert_scale.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/sql_server_management_studio_2017_mac.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 5404 bytes
SHA-256: 1063ca31f6a37bac8bfd826c7d56f4aae6bda4f56e5109c1634659f374a5b679
font_01_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 12180 bytes
SHA-256: bf7a758bb7cb14f8d596e69f8a52a2c5895d2567e21f1a9e4ea92cd75cd23ab7
font_02_sfnt_off000137ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EF 16120 bytes
SHA-256: 2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e

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