Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7eb3d8e11d0457…

MALICIOUS

PDF

72.2 KB Created: 2021-02-28 03:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bd9dd4bf79e19a23e7d0d7a2a4e7b6c0 SHA-1: e6f2c60f757942cecc6ab567af4236081458dc19 SHA-256: ea7eb3d8e11d0457204267d196a01d2955529df5f3b85ae5dbaa4fbf7d55b3c1
116 Risk Score

Malware Insights

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

The PDF contains a malformed stream and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to plumbing, directing users to a suspicious URL. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit PDF vulnerabilities or trick users into visiting malicious sites.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://maypoin.ru/aws?utm_term=how+to+connect+dishwasher+drain+hose+to+disposal+high+loop PDF link annotation
    • http://lomigakorak.getenjoyment.net/night_circus_book_themes.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/bemoruburukufojag.pdfIn PDF document text
    • http://tikovg.xyz/bullinger_figures_of_speechqjedt.pdfIn PDF document text
    • http://igclienteam.com/youwave_emulator_free_for_windows_100nv30.pdfIn PDF document text
    • http://andyhong.blog/819309323089fdn4.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/77084771047.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/datarofapakil/45824618136.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/ausforming_vs_austempering.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/descargar_diccionario_espaol_ingles_gratis_para_pc.pdfIn PDF document text
    • http://lojojijozopixaz.epizy.com/how_to_write_a_script_for_a_presentation_examples.pdfIn PDF document text
    • http://moxurux.epizy.com/pupode.pdfIn PDF document text
    • http://xevivalekivo.epizy.com/arctic_fox_color_mixing_guide.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/veboj.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/acth_stimulation_test_protocol.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 5388 bytes
SHA-256: 42d3418aa6aaadb65bdf5adae70bbb827cf8d54edd540c41e2eed20032abba04
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 10208 bytes
SHA-256: 74c02629a77577151ffe421a8391ea99390ff4b6a48eede99aedf466bf376666

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