Malicious PDF — malware analysis report

Static analysis result for SHA-256 04bb96b2327b51e6…

MALICIOUS

PDF

76.9 KB Created: 2021-03-23 16:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e4a2296cd4a5fa6dbb18583f8e5a638c SHA-1: 2c3a08400ee39fe482b93a69d17f34851847e285 SHA-256: 04bb96b2327b51e6d53965f76d9be987d13e532894bb42d502410f3a24e8bdb6
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to disposable domains, masquerading as driver downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic identifying it as a link farm on disposable hosting confirm the attack pattern.

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://jottigo.ru/strik?utm_term=dell+vostro+1500+drivers+windows+10+64+bit PDF link annotation
    • http://bavewemelemare.iblogger.org/libonijifunozudagosasixi.pdfIn PDF document text
    • http://lassituda.online/metal_rhythm_guitar_exercisesqcvxi.pdfIn PDF document text
    • http://bloomwithdeanna.com/mashup_mom_sheet_pan_sausage8dcez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_603d00cc5022f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_603a3fc0e5c24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_601f92faacaaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5ff8ee525066c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_604fbab885d86.pdfIn PDF document text
    • http://ideal-it.fun/what_is_sat_and_sat_subject_testnivhd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_603248e03a90d.pdfIn PDF document text
    • http://vigorutijiwek.22web.org/ejemplo_de_un_dialogo_de_una_obra_de_teatro.pdfIn PDF document text
    • http://bostpolamos.site/how_do_i_fix_my_printer_driver_is_unavailable4eris.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/yours_forever_chords_kari_jobe.pdfIn PDF document text
    • http://muxoman.mygamesonline.org/area_of_irregular_shapes_worksheet_4th_grade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5fe453c7c5c1b.pdfIn PDF document text
    • http://lirerigoteses.22web.org/19783249522.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvetaso/mirae_focused_fund_fact_sheet.pdfIn PDF document text
    • http://tenovelipa.rf.gd/toastmaster_table_topics_for_thanksgiving.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/washington_state_senators_phone_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/bermuda_triangle_movie_in_tamilrockers.pdfIn PDF document text
    • http://buxamojajowolos.rf.gd/roxofen.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/singulaa_vocal_remover_apk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 5460 bytes
SHA-256: b37e7386b627ff35f5cf6c5033aedf488771ed59d78e14123bee7d6cc90ce597
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 10872 bytes
SHA-256: 408db4766917c7f86d75de4340a4cd1aaae14993bb663997043fa4aaa4b9f896

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