Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b2b8c38f092629…

MALICIOUS

PDF

78.9 KB Created: 2021-03-18 19:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4e3e3d845a97645020a9ed8a67b5065a SHA-1: e140e1cd6326440668ee2243e8f38165e14609ad SHA-256: 47b2b8c38f092629b9296bc745b519e6b80ad1d6d1a47f0e253f1b4a9c2cea6a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=how+to+reset+washer+lg PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408871/normal_604a50bcdcae3.pdfIn PDF document text
    • http://twitter-center.com/448649725340yzjq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_6042cc5db78a0.pdfIn PDF document text
    • http://swiss-gear.store/zapukvow8k.pdfIn PDF document text
    • http://itdomen.fun/backlash_susan_faludi_espaolks13o.pdfIn PDF document text
    • http://pollsexpert.com/35995557754qbu8g.pdfIn PDF document text
    • http://importants.space/evaluacion_psicologica_fernandez_ballesteros0uxqk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_603428cb44c48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465270/normal_5ffa924ddc7a6.pdfIn PDF document text
    • http://qwert-ita.fun/financial_statement_report9vqw7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_601c89fe8b3f8.pdfIn PDF document text
    • http://rubeatyshop.xyz/bmtc_application_form_bus_passmtdu8.pdfIn PDF document text
    • http://redpandarecycling.com/dujilisikufadab7kmu.pdfIn PDF document text
    • http://shtangye.xyz/difference_between_guitar_licks_and_riffshyva9.pdfIn PDF document text
    • http://moshon.space/best_textbook_for_analytic_number_theorygks3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_b1c8a6e73a28495ea14f14c3b5aa89d4.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_7a37ddd05acf431d9643cfae8fa0556e.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_3e6fb1626a5c449e902970ea03072a19.pdf?index=trueIn PDF document text
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_e54e5253688647fc957cf03d296be135.pdf?index=trueIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_55ed49c0a4ee44b0ba27ceaa38cf6910.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/basic_bookkeeping_spreadsheet_free.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_5545b86ef45745649e405e83b5cc7d71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/business_and_management_course_companion_oxford.pdfIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_03a176969c3242bb9dac58775dba0720.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinadi/child_play_3_tamil_dubbed_movie_download.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_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 5000 bytes
SHA-256: 987372b418c1b89537bfefade3ed9ffc7a4072b3d5c2fdcc2c96ce123f537c52
font_01_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 10788 bytes
SHA-256: 665cfb76863110cc21a2edbccf43f4d0874d2572d57297c15771fc2986d5c6d4