Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3430ce3f5b16719…

MALICIOUS

PDF

77.5 KB Created: 2021-02-28 06:19:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7f6b85f34519fb5d93d9fdb91353419 SHA-1: 3fe28e9fff5cae650c04252427cb38163f64c2ea SHA-256: f3430ce3f5b16719d1abbdbc44b3eae67a192d8a0a008720bd33a9b3d65b7645
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=dyson+ball+animal+2+part+number PDF link annotation
    • http://blaugrana.ru/gmetrix_illustrator_test_1_answers44i3t.pdfIn PDF document text
    • http://uscreditmonitoring.info/pdf_ecology_and_environment3wqag.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/when_does_tokyo_ghoul_season_3_come_out.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_60246d9fb6862.pdfIn PDF document text
    • http://alisabor.design/aluminum_die_casting_alloys2vsbc.pdfIn PDF document text
    • http://org-fruit.space/22954612556h9eaa.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/njdot_pay_item_catalog.pdfIn PDF document text
    • http://maxist.ru/what_to_do_after_binging_and_purging6v3ta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383795/normal_60049083b1263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_602454afc0a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_602d24fc3345d.pdfIn PDF document text
    • http://punejew.mygamesonline.org/problemas_de_solucion_de_triangulos_rectangulos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zagofij.onlinewebshop.net/john_g._lake_sermons_on_dominion_over_demons_disease_and_death.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/sadepa.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/xedataluli.pdfIn PDF document text
    • http://jemileti.atwebpages.com/titansgrave_character_sheet.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/zekorapubigisirumatimonul.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_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 5336 bytes
SHA-256: 252b108a4855b9fb2f4a6bffb2b74095b4cd19982dfd71aa2bb6aa6f986b9051
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 11388 bytes
SHA-256: 9e9985959767b5bfedcd5b839613fa42be1bfcb6f6ced512d8c2c99c19ab6b9a

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