Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b146288c62e0f8…

MALICIOUS

PDF

83.7 KB Created: 2021-02-24 22:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: de1065bbaa64ebeda68bae419c52431f SHA-1: f118b443e975102aefebd5adb21398194f9946ff SHA-256: 56b146288c62e0f807a2701a1d7d5107704e32b2a84a9a3f81e2249db75df190
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL pointing to a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=star+trek+voyager+episodes+to+watch+before+picard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369771/normal_601a551216f0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5fec69b6b0e22.pdfIn PDF document text
    • http://macsk.space/64780071947hg6nx.pdfIn PDF document text
    • http://cleaner-inn.club/sap_predictive_analytics_jobs_ukmqbmg.pdfIn PDF document text
    • http://nout-prodat.site/ielts_general_writing_task_1_downloaddluig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_6022674562b29.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/can_a_highlander_hybrid_tow_a_trailer.pdfIn PDF document text
    • http://sy0n.icu/ainda_te_amo_joo4hyog.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/jibebikupetazakazuko.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/where_is_the_lint_trap_on_a_front_load_dryer.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/75360805175.pdfIn PDF document text
    • http://frut-tree.site/directions_for_using_splat_hair_dye7qasm.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/proceso_de_investigacin_de_mercados_tursticos.pdfIn PDF document text
    • http://tokio-2020.fun/pamevibagexadulurezafemar4afc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5ffaa709ad7d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pujumek.myartsonline.com/xofanawif.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/citizen_blue_angels_watch_stopped_working.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/do_all_oral_b_brush_heads_fit.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/dillon_650_toolhead_stand.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 5628 bytes
SHA-256: 59b1b80eb810c9bbdfe8c7b72ddc972e3ea4cac791b686feb42e6ae66518937c
font_02_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10968 bytes
SHA-256: ac65ac8624373deab66ca49fa8338e0c9ff9b068d233bd541e364f579cff5c73
font_03_sfnt_off000132dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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