Malicious PDF — malware analysis report

Static analysis result for SHA-256 abceef5a34cf502a…

MALICIOUS

PDF

66.4 KB Created: 2021-02-11 14:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c809c50c47a16b7c2ab84039deee94ba SHA-1: c4844b29e49db6c52e8f574970f512ce3b8d3893 SHA-256: abceef5a34cf502aaa4e38385c8f81e0ce439e85e4d81a92094f40405efb06f0
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a 'Cimbali m29 parts manual'. No scripts were extracted, but the presence of external URIs and the ML classification strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=cimbali+m29+parts+manual PDF link annotation
    • http://zuluwana.iblogger.org/alcatel_u3_3g_user_manual.pdfIn PDF document text
    • http://kernig.pro/planes_controlados_telceljc492.pdfIn PDF document text
    • http://hookup757.fun/5._1_certidumbre_riesgo_e_incertidumbrelt5w2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakusidoler.epizy.com/66461511807.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/brother_sammy_worship_audio_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/vtc6_sony_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/59952884758.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/78746330178.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/tadomekobodatanawejef.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/73557481049.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/bubble_bobble_hero_2_pc_game.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/28408558099.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/kovigaso.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/nokokepukop.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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 5300 bytes
SHA-256: d9b25c9a4c5374c2e7db2d52504f9825719cbb0a432c1846b803509f64998a8c
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 10592 bytes
SHA-256: e8ecb19a788cf14199983c013a23796a51ede3baf20236dddfaee23bab37fc1f

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