Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b1bc14c14f48c9…

MALICIOUS

PDF

83.1 KB Created: 2021-06-06 17:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 404576cba919044370829efe584617ef SHA-1: 539d870314d08aeffce254092e31a89a69c39bf8 SHA-256: f7b1bc14c14f48c9d5c330726263659738fcfa94805860ee65485e8db74f570a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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://archism.ru/pbw?utm_term=how+to+use+a+convection+microwave+as+an+air+fryer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393925/normal_60415648a1752.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/3f1cc5294ee393.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/7128998.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387939/normal_60b6e8d9d55d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_6034420b5a674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_603cbe08aba9e.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/675517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_605cf75312190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144491094/mawubeguvojonaxuluwefaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/036cbb2e-cce5-4009-9753-fbbfb4f166d9/44097598995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e224c8-7109-4524-a79e-e4404b08d8ac/11838578730.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144426759/todipixawonojewezizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ca649c-51e7-41a9-8f88-ffbc3bf8f0e8/xonex.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/nefudujusibefud.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/f/98381367760.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144414867/solar_system_pictures_with_names_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28caaf5-46e5-4064-95e9-4c896823db79/best_video_streaming_app_apk.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/144564294/64676236072.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 5092 bytes
SHA-256: 6f4ce116db66b56f312e29a067a7d4c595c92c6ad5cf4042675528fb276007dc
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 10752 bytes
SHA-256: cd81118f7f6af4f3469d2748700ef9462fe22b7c30d75e9ecf1cd93c8aa08f35
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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