Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bf47a5e7c0a802…

MALICIOUS

PDF

82.6 KB Created: 2021-03-28 18:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4663ccd7a751f6e9408ac9b5105caf18 SHA-1: 51e71ef285202067c25a67ab28f86f58189d15b0 SHA-256: 78bf47a5e7c0a802b7297a8be75b5a52813e19368cd663576753793f342d11ed
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically designed to mimic a search result for a medical assistant test. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=how+many+questions+are+on+the+ncct+medical+assistant+test
    • http://abanca-electronica.com/dollar_store_deals_canada1tt5w.pdf
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5fce751c0924e.pdf
    • http://gapofar.22web.org/15526969121.pdf
    • http://craftsmansmetics.com/99034779380szmaa.pdf
    • http://thiswaytovogue.com/vikomo4aad2.pdf
    • https://cdn-cms.f-static.net/uploads/4370263/normal_605d86bf1f569.pdf
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5ff080e350a29.pdf
    • http://nncucuucuc.space/opel_cascada_preislistet7drs.pdf
    • http://govusosu.iblogger.org/hardens_london_restaurant_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4390074/normal_600a9fcad199c.pdf
    • http://dilomevoje.22web.org/63512069989.pdf
    • http://skout.tech/the_noble_quran_arabic_with_english_translation__transliteration47ba1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sudebavegubud.epizy.com/70265366537.pdf
    • https://s3.amazonaws.com/vasofirida/32719189484.pdf
    • http://fejusudoboriduf.rf.gd/40148903779.pdf
    • http://zokitidekav.epizy.com/kaxijipozatu.pdf
    • http://webexewidulub.epizy.com/acta_de_nacimiento_veracruz.pdf
    • http://dijazulebok.epizy.com/auriculotherapy_free_download.pdf
    • https://s3.amazonaws.com/tixeligufokup/gimeguwuvapenesipizibugeg.pdf
    • http://kutepiguzusudax.epizy.com/nivinezobomizo.pdf
    • https://s3.amazonaws.com/rizoli/best_free_chess_games.pdf
    • http://gidiruroxab.rf.gd/47737835821.pdf
    • http://xasuwuf.epizy.com/89058692839.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_off0000f6c4.bin
bb1e6241b1d8736a76eda447a1fd2955e06211daac911db3c810ad552819c518		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 5344 bytes
font_01_sfnt_off000108c9.bin
ed720f1f2e8717659e64a8ca17bba9c4d26b44b127c68ecd28585ab76bd8f4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 10860 bytes
font_02_sfnt_off00012dd8.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 4324 bytes

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