Malicious PDF — malware analysis report

Static analysis result for SHA-256 4193dde48c045612…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 04:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 397a375c7fc5ef19de87701d10d98200 SHA-1: b4a38c6662be12433c1aff6967cf6fea1ec71f18 SHA-256: 4193dde48c045612ca7f50d5e433cd3387a4b9b4bc974d761c71003b4c22b9c2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files on different domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=do+steam+dryers+hook+up+to+cold+or+hot+water
    • http://canonsburglake.org/iron_jawed_angels_movie_answer_key67235.pdf
    • http://teguruta.medianewsonline.com/acca_f8_notes_2020.pdf
    • http://juxowupekabaf.mygamesonline.org/fakuriladedulet.pdf
    • http://dosijefa.mypressonline.com/zexesaziwamavaliporu.pdf
    • http://tehnotop.site/dell_m6800_laptop88hp06d.pdf
    • https://cdn-cms.f-static.net/uploads/4403823/normal_601db5d3a2ef5.pdf
    • https://cdn-cms.f-static.net/uploads/4478422/normal_6024752c2d505.pdf
    • http://zivemigidefis.mypressonline.com/que_es_un_afiche_publicitario.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_f1039a3f23054946b49aee9c18859c70.pdf?index=true
    • https://s3.amazonaws.com/vuterijoze/how_to_write_a_one_page_reflection.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/nukovutuxidojo.pdf
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_3f240556dce8404db357c43d59f84506.pdf?index=true
    • https://s3.amazonaws.com/pegebunov/1507259862.pdf
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_d06bdb7abe4a411983dec335ed10d230.pdf?index=true
    • https://s3.amazonaws.com/kegubinefuda/sibum.pdf
    • http://lawewil.atwebpages.com/rabobefel.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_6f2e76d7e6ca44e090bb5f7140f51060.pdf?index=true
    • https://s3.amazonaws.com/luxaduzimase/agudas_llanas_esdrjulas_y_sobresdrjulas_ejercicios.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4c.bin
3351605e20b823aeb49a65b5b397c8ae8d2c8bb29a63aa8511fba12964bec048		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 5572 bytes
font_01_sfnt_off0000ff2c.bin
8893bfda2b8707ae5af4e518ec81e2f954dd6c948d4b8b75f2eb25cf8a8325e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 10680 bytes

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