Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d59cf170d0dcbd…

MALICIOUS

PDF

74.1 KB Created: 2021-03-29 02:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aceb051a0c84c4e3806bd00957866df5 SHA-1: b513aa6bd458d674fe30e1a974196b927ed740aa SHA-256: f1d59cf170d0dcbd1bc48313ec0f9c0db96a4cecbd2e143c367312ef2d5e4b55
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/123?utm_term=contract+amendment+clause+template
    • http://praktika-ingenieur.com/45295081730hmz86.pdf
    • http://vkrowl.com/divine_mercy_catholic_church_and_academy_merritt_island_fl4wplf.pdf
    • http://esplus.pro/mountain_athlete_sandbagio72t.pdf
    • https://cdn.sqhk.co/tubafejog/aNhgHja/lutuduboripikovepupuvuwoj.pdf
    • https://cdn.sqhk.co/remezebona/h8QGlib/proline_mic_stand_ms320tb.pdf
    • https://cdn.sqhk.co/businaxidare/KHbsgie/crowd_definition_informal.pdf
    • https://cdn.sqhk.co/guvevifowo/ignjfJH/lazavino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lorugipopuxe/cheerleader_uniform_sims_4_cc.pdf
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_8c2bebcc307c44adb3d95d418b8792fa.pdf?index=true
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_62d1e077bf164565b251d0cc0d91b7ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d6e4334-eec4-4ec9-8dd9-3e4aeb1cdd10/33199318491.pdf
    • https://uploads.strikinglycdn.com/files/0611afa0-2770-4944-a1eb-26fc584b6c02/mazataroserire.pdf
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_5267e7b3008d4a098b26f687e11a5252.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87c4690b-457f-4303-9483-8eee72d3afa1/what_neutralizes_pet_urine.pdf
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_b56e14d3f84a4ede8f17d1fecd8ea8d1.pdf?index=true
    • https://s3.amazonaws.com/poresi/pamikegirajurike.pdf
    • https://af4bb04d-41a2-413c-b691-ce0a46ff998d.filesusr.com/ugd/e677f8_8a06771f49fa4ddabc2ee120680e8a7e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e9d1ce61-9be8-4450-8dd7-19d303ceabb9/what_were_punishments_in_medieval_times.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_30fac8aee21844b2ae107ffabdea9a6f.pdf?index=true
    • https://s3.amazonaws.com/vebisop/23446151405.pdf
    • https://s3.amazonaws.com/fedure/bygone_days_concert_version_sheet_music.pdf
    • https://s3.amazonaws.com/bisapovepizaj/kanesomag.pdf
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_52a530316a2649bdbff4f0834cad90f6.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_off0000e854.bin
8a90283ce138a586762a02744b933711e719aa7c77c9a381628873c76ea09df3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 5124 bytes
font_01_sfnt_off0000f9a0.bin
61121986bf9a6fbc9941d1436e5bc2d7555942ad9c9f3651d0a9bb75d90c88da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 9756 bytes

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