Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee48656eb1f34e9…

MALICIOUS

PDF

90.4 KB Created: 2021-03-31 20:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca023e1b679489afa885c0d46ece5d4 SHA-1: 789cad8d0cc45e80618bc944b9a9556823043366 SHA-256: eee48656eb1f34e9ac1c2ffca9f2c2a4466e7fe5420e21cecbbf483339cd68c8
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one specifically pointing to 'vilenefex.ru', suggesting it's part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/123?utm_term=ccna+netacad+chapter+8+answers
    • http://sibixujuw.22web.org/canal_de_aprendizaje_visual.pdf
    • https://cdn.sqhk.co/noruwotil/ae0iehj/linear_regression_python_numpy.pdf
    • http://ozalupa.space/what_is_conversational_voice_in_english_grammarvldti.pdf
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdf
    • https://cdn.sqhk.co/jaziwuke/hgfiVhd/pofif.pdf
    • http://picsonair.com/dd_warlock_spell_guideg2qnu.pdf
    • http://topmassage.net/10871714958sf97l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_c355a997c9bf410db29ab8c4e61a2493.pdf?index=true
    • http://fevumuweli.rf.gd/agile_software_development_with_scrum.pdf
    • https://uploads.strikinglycdn.com/files/d4a1ddae-8127-4812-af7d-7a64815f7ccc/the_ministers_black_veil_summary.pdf
    • http://loreloduvotopu.rf.gd/netapadazaligomufolinakil.pdf
    • https://s3.amazonaws.com/tufujifinobiro/lisp_for_autocad_2015.pdf
    • https://uploads.strikinglycdn.com/files/6cea1ddc-bcbb-49c6-ae29-ebca4ca1ca19/nukin.pdf
    • https://s3.amazonaws.com/voxulija/44323682705.pdf
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_92784ad72bd9452a8d9bf69c52c6098e.pdf?index=true
    • https://s3.amazonaws.com/sowirutelevolur/37675706152.pdf
    • https://s3.amazonaws.com/xukonakefules/international_ring_size_guide.pdf
    • http://tinanatibora.rf.gd/risk_assessment_meaning_in_information_technology.pdf
    • http://kewivifonawati.epizy.com/car_crash_accident_report_sample.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011787.bin
d3f632e9bf13d5c93ffda9e96a6c5a7ad261255f0d1e9046ae734bda053c7fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11787 5068 bytes
font_01_sfnt_off000128b0.bin
2b2eb9b5603ad8ea4078ab75fc4691c1f03c822b9c785f2cce50ffa82012a0a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 11148 bytes
font_02_sfnt_off00014eae.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAE 4324 bytes

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