Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6639a6ce4fd7d8…

MALICIOUS

PDF

69.3 KB Created: 2021-02-24 05:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dcf8356ed4a5add934e6154c9e7370ab SHA-1: dbd43dba9e2a59581560821a6e38702ee4c30b14 SHA-256: db6639a6ce4fd7d8da07f2768054e5847f0315fed3bb178b83db99e4ab53d5e2
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically designed to mimic a search result for "mililani middle school map" and redirect to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead the user to a malicious site.

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://baarspo.ru/wix?keyword=mililani+middle+school+map PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461229/normal_601f6893dfcf4.pdfIn PDF document text
    • http://vykupavto54.ru/letter_sounds_worksheets_kindergartenz2tl3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5fd7d3c8e49e8.pdfIn PDF document text
    • http://konsalting.info/informacion_sobre_la_caverna_de_las_brujaseredj.pdfIn PDF document text
    • http://minuette.me/tapiraltvf64.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/wituxefaf_sajifemoxevu.pdfIn PDF document text
    • http://discount50it.pro/82949381418ed073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_601d5c487f95b.pdfIn PDF document text
    • https://lowunidedalovel.weebly.com/uploads/1/3/1/3/131380213/wovanixewifedab.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/90441c9756aaa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503692/normal_601d6345179ad.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/lulikozufoxuwafenus.pdfIn PDF document text
    • https://mibirewisurux.weebly.com/uploads/1/3/5/3/135313447/5f738314.pdfIn PDF document text
    • http://mushygushysayings.com/55045058031xlfk.pdfIn PDF document text
    • http://vash-fasad.live/what_are_the_different_kinds_of_zodiac_signsi68xs.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/petubapizo/95135082639.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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 5224 bytes
SHA-256: 5e8441e22a3996fd6dc7ae916acf9ee1f402c246f1a8ba4c7988ad61948cd20b
font_01_sfnt_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 10120 bytes
SHA-256: 917b60504f0ec4d4f553cd5cd7babd8ccf225da6d6e9951dbeb8d1cbc330ad06

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