Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4076b9b5db51a23…

MALICIOUS

PDF

94.9 KB Created: 2021-03-12 10:01:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2f72eddef41c62277d703a216c7fec6d SHA-1: f28fc9f5f1fb1a09f442b61062c3e9fcf44b74d1 SHA-256: b4076b9b5db51a230176925d717e6b0737e1eb20f0a511ead351eb0c008dfef9
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

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://ponafet.ru/strik?utm_term=how+much+is+nikon+d40 PDF link annotation
    • http://wemufonenirivor.22web.org/11204723444.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/64906471435.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/convert_ms_word_document_into_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_6026b2b5c92b0.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/what_are_cognitive_milestones.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/89489680181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5fd876fc77c42.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/vegiwituwaromemiboki.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/refikabexexoxupipasaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_60278c4f55fce.pdfIn PDF document text
    • http://zuwaweno.iblogger.org/5377265506.pdfIn PDF document text
    • http://venulejow.iblogger.org/17191281208.pdfIn PDF document text
    • http://momarivido.mypressonline.com/selene_diosa_de_la_luna_mito_griego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funedoja.epizy.com/79422552660.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/moto_360_2nd_gen_specs.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_584069483a1442dd92b04e0080293af7.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_6143ed5004274cf8a8d22441df9bbcfd.pdf?index=trueIn PDF document text
    • http://rujolur.rf.gd/cetoacidosis_diabetica_en_diabetes_tipo_2.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_a8272f40901a49f78d34319604986699.pdf?index=trueIn PDF document text
    • http://vanakodezifezuv.epizy.com/kisitatijewojefuzedule.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_2a7a1065b2074d9387d92edec6742566.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_e08c8f782f1847d09f409daf5b327105.pdf?index=trueIn 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_off00013689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13689 5188 bytes
SHA-256: 8c6a53fdfd51012fedcd79f871fd1b44ae28eb1a47df86f3f1b8e3f7c977cb50
font_01_sfnt_off00014827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14827 11124 bytes
SHA-256: bcc153c8fe1fd2007147c42da9a7892cbe29f7c3520c962abd9225f64c4a5201

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