Malicious PDF — malware analysis report

Static analysis result for SHA-256 a528ef690739c95d…

MALICIOUS

PDF

73.7 KB Created: 2021-03-15 09:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73c8ca5a87fc1452b3763928dbb27ac SHA-1: ad2a7214c89f3ac8b054a5e4b9139bfab8c6c941 SHA-256: a528ef690739c95d679b1a3c8c1eaae8d9f28acaea6a4e601b37a62535f018ef
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to 'vilenefex.ru' and a query parameter suggesting a lure related to 'south carolina dmv forms'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure and embedded links suggest it functions as a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=south+carolina+dmv+forms+400
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fef7dbc4e10a.pdf
    • http://indir-kazan.com/togaginupizinowtvv.pdf
    • http://impergamon.com/how_to_calculate_days_in_excel_between_two_dateswo4jn.pdf
    • https://cdn.sqhk.co/bofagenined/f6Gjjgj/english_grammar_worksheets_for_grade_1.pdf
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/131291.pdf
    • https://cdn.sqhk.co/xonipavu/2LeiaXT/only_fools_falling_through_bar.pdf
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/powonabude.pdf
    • http://mmuuue.space/12145800255kp3g.pdf
    • https://mofomajem.weebly.com/uploads/1/3/4/3/134349017/kegawoxel_ladutoloti_bogalarose.pdf
    • https://cdn.sqhk.co/jasowipe/dYgd8hg/the_king_of_fighters_98_the_slugfest_rom.pdf
    • https://cdn.sqhk.co/bamewimoxatu/bgjajbf/t-_mobile_ceo_news.pdf
    • https://cdn-cms.f-static.net/uploads/4393361/normal_6015d82904599.pdf
    • http://gebuhrenfrei-mein.com/rewiso5ubk.pdf
    • https://cdn.sqhk.co/vujaderaz/iiasVjb/bazooka_boy_2_unblocked_66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zufavikog.epizy.com/bmp_to_converter_freeware.pdf
    • https://uploads.strikinglycdn.com/files/b8607764-5f8f-4e6f-9772-a74c406b998f/shakespeare_sonnet_116_summary.pdf
    • https://uploads.strikinglycdn.com/files/1482eb5b-ce4e-4b27-8ec0-e50a5fb6e765/how_to_build_android_app_using_python.pdf
    • http://batofudinub.epizy.com/puletowuxafover.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_off0000e357.bin
026602e16e627d59a9a91f4def995c82e49b386bddaa50c0d980497366ab4fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 5656 bytes
font_01_sfnt_off0000f677.bin
3b0a0d71d5ca77f9601fddc2c41ae90ae6dcd3ea379e1f8f0f252d4e68a94959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 10404 bytes

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