Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5aa20502df4738…

MALICIOUS

PDF

90.9 KB Created: 2021-04-22 03:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f83e18d974d31ade7fbf09653c788e93 SHA-1: e395a68f4037c81eca949075e533071f9d85f10c SHA-256: 0d5aa20502df4738db7b58efbbb8947aec2f151f626e21e32c6c1aee9414fced
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lead the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://pelibifir.ru/strik?utm_term=descargar+musica+mp3+gratis+online+para+pc
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/986652.pdf
    • https://cdn-cms.f-static.net/uploads/4481056/normal_60490d36cf458.pdf
    • http://lixidepobejoji.mypressonline.com/xazokafusopixe.pdf
    • http://xidufefonudug.sportsontheweb.net/67129420777.pdf
    • https://cdn-cms.f-static.net/uploads/4443803/normal_60112d99cb59d.pdf
    • https://cdn-cms.f-static.net/uploads/4450243/normal_60652c9e34fac.pdf
    • http://duvejiwuxikon.getenjoyment.net/73987861997.pdf
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5ffe6f7e516bf.pdf
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6052cbf8af703.pdf
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/bozitoxobudugogi.pdf
    • http://gilumesu.mypressonline.com/school_calendar_2020_20_deped.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vunizi/biochemical_analysis_of_honey.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_cb9905fc63b1439c997c7ed7c7a60e92.pdf?index=true
    • https://s3.amazonaws.com/lekizopiloref/performance_improvement_plan_template.pdf
    • http://ligekasuxube.onlinewebshop.net/handbook_of_affinity_chromatography.pdf
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_3e37b3fd746847f8810cbc9d4359fe48.pdf?index=true
    • http://jirabasojexosud.atwebpages.com/gepidalojowel.pdf
    • https://s3.amazonaws.com/saziwijaxodav/will_there_be_any_harry_potter_spin_offs.pdf
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_882fd1ab925e4a9cb10265f8345fc84a.pdf?index=true
    • https://s3.amazonaws.com/lowuwofuxali/social_animals_movie.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3e.bin
40e0ad21b19df3db216fd06b1281b08faf1616a5a4e0e4362360d049e0fe8d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 6832 bytes
font_01_sfnt_off00010e8d.bin
5f5ea8b60dbb52788f2a4c3825d0eb67fe7949bd345e69fdc564e71227fe392e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 5416 bytes
font_02_sfnt_off000120ed.bin
1f5cba3f3b7519feafc0bb0904dfdd068150369dc9b7144234d735923470e7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 11756 bytes
font_03_sfnt_off0001474d.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1474D 16312 bytes

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