Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c19d732a6df826…

MALICIOUS

PDF

72.4 KB Created: 2021-03-18 21:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2b2e4fac2a872c031b0268bbd4e82ac7 SHA-1: 0f9d344edbae5593e64aee3f4dcd955140fb8d4f SHA-256: 76c19d732a6df826e09af7336ab9f977ae975ef958885644435e1657fa78357e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a prominent one pointing to 'zajinet.ru' disguised as a parts manual. Heuristics indicate it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=buell+xb+parts+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/detokelixipi/ShfheRf/nudufutojedesogogepul.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/pjhh36O/97817071265.pdfIn PDF document text
    • http://itasummer.fun/95784028402erdu5.pdfIn PDF document text
    • https://cdn.sqhk.co/jilazelitor/Djajchf/barewoxadoweluk.pdfIn PDF document text
    • https://cdn.sqhk.co/dubezaxuviz/jdXjdjc/ruforigoze.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/yFqJzie/56215416281.pdfIn PDF document text
    • http://pojokup.getenjoyment.net/quality_management_specialist_healthcare_job_description.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/61764128325.pdfIn PDF document text
    • http://denizan.com/gafifarigomivojomcjb.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/the_auditory_system_anatomy_physiology_and_clinical_correlates.pdfIn PDF document text
    • http://shopsmmv.site/formato_historia_natural_de_la_enfermedad_para_llenar0etqb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_0d7c34f9b7a24eb5bf6586aa67dabcbe.pdf?index=trueIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_ef97dab7fa17449fb5c3b80edea9b1ae.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_544dc78d9f4d4b3e9de73c63f6acf72c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/us_consular_report_of_birth_abroad.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_8a216e8f8ada482f82b5f7464307e58e.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_f932ea3894834b2792d98467720c5407.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_9e181c261a7a45368731e258b7949756.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_5cbaaa3d1b0a41768eb6165b04e86d00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/xatemowupo.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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 5444 bytes
SHA-256: a44741ec11e39be21cf47ef69b92a191a3371783cbc8d569d1a2b9db4cfcbf17
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10280 bytes
SHA-256: 8f181757f7cd0ff7dcbbd7e24e48ed486c4bcbb82cadd0f1b2ee2c3aa3d5e0ec

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