Malicious PDF — malware analysis report

Static analysis result for SHA-256 97505893fa722cfd…

MALICIOUS

PDF

72.4 KB Created: 2021-03-24 23:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e9fb2e14240e782ec89727f1c9fa66e4 SHA-1: ce314f88204644f99beedef1ee30eff24f1d3dbb SHA-256: 97505893fa722cfdcc2b221028a324fdcca6a2c4104aaba1f0457d89b597c2ae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards a common tactic of redirecting users to malicious sites, potentially for credential harvesting or further payload delivery.

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://gimoguvi.ru/wix?keyword=alkanes+and+alkenes+worksheet PDF link annotation
    • http://pukebebizadolu.mypressonline.com/dan_brown_angels_and_demons_series_order.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_6026b2ab350ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_6045f4d7366cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_6017c4df59ee6.pdfIn PDF document text
    • http://fajesamosini.sportsontheweb.net/common_english_words_with_tamil_meanings.pdfIn PDF document text
    • http://kitixukizogutik.mygamesonline.org/muzujumojasomijeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463794/normal_5fec4c915890e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393628/normal_60437ff3e1382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385028/normal_600036a6f31a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421959/normal_5fe3dd797da57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_602421a9a1d63.pdfIn PDF document text
    • http://sugalomiwuto.getenjoyment.net/66122488019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366331/normal_5fcf70c867cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5fd912d894723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafikepuvanotu.epizy.com/newborn_baby_girl_my_first_christmas_outfit.pdfIn PDF document text
    • http://wubixulazig.rf.gd/93718017836.pdfIn PDF document text
    • http://tunozesanapi.rf.gd/pekogap.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/why_does_my_skin_burn_but_no_rash.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/introduction_to_cryptocurrency_trading.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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 5060 bytes
SHA-256: 61e945dbf251408a1fcd09837b46315daa88d76ef40a3b445cfb3ab9ed969ec1
font_01_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 10676 bytes
SHA-256: eafc36f9b412c33b6fb359220577c1ce64f52e8cdd85e7655ec4723a287de788

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