Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4a48014a2a6261…

MALICIOUS

PDF

62.3 KB Created: 2021-02-24 02:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 074de34535652e02e8d89c38edf154fe SHA-1: 766cd9729a236e7d45c2558d0ab41c35ebe44d70 SHA-256: 3e4a48014a2a62619f1c3311e50764e5cd4ff2e34ecb68f18a5ad16e995db072
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URIs pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=how+to+use+essick+air+humidifier+bacteriostatic+treatment PDF link annotation
    • http://tramlaweq.online/10255060171r0hht.pdfIn PDF document text
    • http://cashbackk.site/91352688036389bx.pdfIn PDF document text
    • https://ripufimavewin.weebly.com/uploads/1/3/6/0/136099474/7642251.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/e6hjjbM/puxenowatimiwedade.pdfIn PDF document text
    • http://fabulouss.space/jobujijiletey8wnl.pdfIn PDF document text
    • http://axecheat6.xyz/10th_class_maths_notes_inza56d.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/jDZjhRk/muvikogis.pdfIn PDF document text
    • http://kvyovk.xyz/bugunun_saraylisi_1_sub_espanhol9syv7.pdfIn PDF document text
    • http://easterthjg.com/google_sheets_dependent_drop_down_listb5vuc.pdfIn PDF document text
    • http://forkidsshop.online/sobosolefusigoliwicjenx.pdfIn PDF document text
    • http://ing-cliente.com/ata_chapter_25dkor8.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/hhihcnk/gegewajezajulusugigugiga.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/ILxif4t/bank_robbery_ios_game.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/d025cd14bb85e84.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/zumezeviwakiz/91181074059.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/41898331112.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/84689641148.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_off0000b4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BB 5484 bytes
SHA-256: cb3d7a43410b0f7eca7cfa806762c392de4a4e3ab4aa32d112c2b3bd6c58e389
font_01_sfnt_off0000c745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC745 10244 bytes
SHA-256: a62d97c4bdab17a9101fe2a69219db2445a77c06ffb52237fac9f01fc3c58b9b

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