Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e146fc9d529fbda…

MALICIOUS

PDF

79.5 KB Created: 2021-03-16 19:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 21921e6908a178ca5247b90fb1649bf8 SHA-1: fb02f5b495efa8b14caa7567c28de9eee5c77ffe SHA-256: 8e146fc9d529fbdac83693dceac63c2bc5eaf589d0d4e8b6f783603a6857a7bf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with phishing and a second URL leading to a PDF file. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to 'Schoology apk descargar', suggesting a lure for users seeking Android application downloads.

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 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.
  • 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://gimoguvi.ru/123?utm_term=schoology+apk+descargar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5fdc155ca8725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_5fd87648648d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_602504f1c926c.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/multiplication_table_worksheets_for_grade_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5ffb66ee7e721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_602da603d33c6.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/zesixefe/fake_amiibo_nfc_android.pdfIn PDF document text
    • http://mulexotuvatago.epizy.com/app_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/powerpoint_templates_progression.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/odia_bhajan_songs_lyrics.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_27f1aa298d7544bd926c67ef76599c8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamovagag/pigisorekiwanuv.pdfIn PDF document text
    • http://gulavofi.epizy.com/57567637498.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/4408586351.pdfIn PDF document text
    • http://bunopudo.rf.gd/universit_di_camerino_ingegneria_informatica.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_448f0540d74c44c7a289fa5c54b98a0c.pdf?index=trueIn PDF document text
    • http://zoguberuwanu.rf.gd/tipos_de_abrazaderas.pdfIn PDF document text
    • http://jidufapikefufeb.epizy.com/tijujos.pdfIn PDF document text
    • http://vejawogi.rf.gd/bluford_high_series_books.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_595924ba8f724b37b6ee29d67664477d.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_8a70ac67f6794be0b40881c2d90f8b44.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 5604 bytes
SHA-256: 4061439bffa696a19cce6a7192d75ddd487e2ce3076345c1ec5df0554c907694
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 11676 bytes
SHA-256: 862e399b67fce374bceb6c9b5bdc929f9d6847c0f11f830ae7970140e405e95d
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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